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\title{Lis User Guide English Version}
\author{}
\date{}
\begin{document}

\vspace*{4cm}
\begin{flushleft}
{\Large Lis User Guide}\\
Version 2.0.21
\end{flushleft}

\vspace*{2cm}
\begin{figure}[h]
\includegraphics[scale=0.7]{irises_korin.eps}
\end{figure}

\vspace*{2cm}
\begin{flushleft}
{\large The Scalable Software Infrastructure
Project\\
{\tt http://www.ssisc.org/}}\\
\end{flushleft}

\vspace*{5mm}
\thispagestyle{empty}

\newpage
\begin{flushleft}
{\small
Copyright \copyright\ 2005 The Scalable Software Infrastructure Project,
supported by ``Development of Software Infrastructure for Large Scale
Scientific Simulation'' Team, CREST, JST.

Akira Nishida, CREST team director, JST.

All rights reserved.

\vspace*{5mm}
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:

 1. Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.

 2. Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.

 3. Neither the name of the project nor the names of its contributors
 may be used to endorse or promote products derived from this software
 without specific prior written permission.

\vspace*{5mm}
 THIS SOFTWARE IS PROVIDED BY THE SCALABLE SOFTWARE INFRASTRUCTURE
 PROJECT ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE SCALABLE
 SOFTWARE INFRASTRUCTURE PROJECT BE LIABLE FOR ANY DIRECT, INDIRECT,
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 DAMAGE.

\vfill
Cover: Ogata Korin. Irises. c1705. Owned by Nezu Museum.
}
\end{flushleft}
\thispagestyle{empty}

\newpage
\pagenumbering{roman}
\tableofcontents

\setcounter{section}{0}
\pagenumbering{arabic}

\newpage
\section*{Changes from Version 1.0}
\begin{enumerate}
\item Addition: Support for double-double (quadruple) precision operations.
\item Addition: Support for Fortran compilers.
\item Addition: Support for Autotools.
\item Changes: 
\begin{enumerate}
\item Structure of solvers.
\item Arguments of the functions {\tt lis\_matrix\_create()} and {\tt lis\_vector\_create()}.
\item Notation of command line options.
\end{enumerate}
\end{enumerate}

\section*{Changes from Version 1.1}
\begin{enumerate}
\item Addition: Support for standard eigenvalue problems.
\item Addition: Support for 64bit integers.
\item Changes: 
\begin{enumerate}
\item Names of the functions 
      {\tt lis\_output\_residual\_history()} and \\
      {\tt lis\_get\_residual\_history()} to 
      {\tt lis\_solver\_output\_rhistory()} and \\
      {\tt lis\_solver\_get\_rhistory()}, respectively. 
\item Origin of the Fortran interfaces 
      {\tt lis\_vector\_set\_value()} and \\
      {\tt lis\_vector\_get\_value()} to 1.
\item Origin of the Fortran interface {\tt lis\_vector\_set\_size()} to 1. 
\item Name of the precision flag {\tt -precision} to {\tt -f}.
\end{enumerate}
\item Change: Specification of the function 
      {\tt lis\_solve\_kernel()} to return 
      the residual computed by the function {\tt lis\_solve\_execute()}. 
\item Changes: Specifications of integer types:
\begin{enumerate}
\item Replacement: The type of integer in C programs with {\tt LIS\_INT},
      which is equivalent to {\tt int} by default.
      If the preprossor macro {\tt \_LONGLONG} is defined, 
      it is replaced with {\tt long long int}.
\item Replacement: The type of integer in Fortran programs with 
      {\tt LIS\_INTEGER}, which is equivalent to {\tt integer} by default.
      If the preprossor macro {\tt LONGLONG} is defined, 
      it is replaced with {\tt integer*8}.
\end{enumerate}
\item Change: Names of the matrix storage formats CRS (Compressed Row Storage) 
      and CCS (Compressed Column Storage) to CSR (Compressed Sparse Row) 
      and CSC (Compressed Sparse Column), respectively. 
\item Change: Names of the functions 
      {\tt lis\_get\_solvername()}, {\tt lis\_get\_preconname()}, and \\
      {\tt lis\_get\_esolvername()} to 
      {\tt lis\_solver\_get\_solvername()}, 
      {\tt lis\_solver\_get\_preconname()}, and 
      {\tt lis\_esolver\_get\_esolvername()}, respectively.
\end{enumerate}

\section*{Changes from Version 1.2}
\begin{enumerate}
\item Addition: Support for nmake.
\item Change: Name of the file {\tt lis\_config\_win32.h} to {\tt lis\_config\_win.h}.
\item Change: Name of the matrix storage format JDS (Jagged Diagonal Storage) 
      to JAD (Jagged Diagonal). 
\item Change: Names of the functions 
      {\tt lis\_fscan\_double()} and {\tt lis\_bswap\_double()} to \\
      {\tt lis\_fscan\_scalar()} and 
      {\tt lis\_bswap\_scalar()}, respectively. 
\end{enumerate}

\section*{Changes from Version 1.3}
\begin{enumerate}
\item Addition: Support for long double (quadruple) precision operations.
\item Addition: Support for pointer operations in Fortran.
\item Change: Name of the members 
      {\tt residual} of the structs {\tt LIS\_SOLVER} and {\tt LIS\_ESOLVER} to {\tt rhistory}. 
\item Change: Names of the members 
      {\tt iters} and {\tt iters2} of the structs {\tt LIS\_SOLVER} and {\tt LIS\_ESOLVER} \\
      to {\tt iter} and {\tt iter2}, respectively. 
\item Change: Names of the functions 
      {\tt lis\_solver\_get\_iters()}, {\tt lis\_solver\_get\_itersex()}, \\
      {\tt lis\_esolver\_get\_iters()}, and 
      {\tt lis\_esolver\_get\_itersex()} to \\
      {\tt lis\_solver\_get\_iter()}, {\tt lis\_solver\_get\_iterex()}, 
      {\tt lis\_esolver\_get\_iter()}, \\ 
      and {\tt lis\_esolver\_get\_iterex()}, respectively.
\item Change: Names of the members 
      {\tt *times} of the structs {\tt LIS\_SOLVER} and {\tt LIS\_ESOLVER} to {\tt *time}, respectively.
\item Addition: Member {\tt intvalue} to the struct {\tt LIS\_VECTOR}.
\item Change: Specifications of the functions 
      {\tt lis\_output\_vector*()} and {\tt lis\_output\_mm\_vec()} to allow  
      integer data. 
\item Change: Names of the functions 
      {\tt lis\_matrix\_scaling*()} to {\tt lis\_matrix\_scale*()}, respectively.
\item Change: Names of the functions
      {\tt lis\_array\_dot2()} and {\tt lis\_array\_invGauss()} 
      to {\tt lis\_array\_dot()} and {\tt lis\_array\_ge()}, respectively.
\end{enumerate}

\section*{Changes from Version 1.4}
\begin{enumerate}
\item Addition: Support for array operations.
\item Addition: Support for alternative workflow PSD (Preconditioner and Solver
      Decoupled). 
\item Change: Specification of the function 
      {\tt lis\_array\_qr()} to return 
      the number of iterations and error of the QR algorithm. 
\item Change: Names of the functions
      {\tt lis\_array\_matvec2()} and {\tt lis\_array\_matmat2()} to \\
      {\tt lis\_array\_matvec\_ns()} and {\tt lis\_array\_matmat\_ns()}, respectively.
\item Change: Names of the preprossor macros {\tt \_LONGLONG} and 
      {\tt LONGLONG} to {\tt \_LONG\_\_LONG} and {\tt LONG\_\_LONG}, respectively.
\end{enumerate}

\section*{Changes from Version 1.5}
\begin{enumerate}
\item Addition: Support for complex arithmetic.
\end{enumerate}
  
\section*{Changes from Version 1.6}
\begin{enumerate}
\item Addition: Support for generalized eigenvalue problems.
\item Addition: Support for GCC libquadmath.
\item Change: Sign of shift for eigensolvers in accordance with custom.
\item Change: Sign of shift in {\tt lis\_matrix\_shift\_diagonal()}, 
{\tt lis\_vector\_shift()}, and {\tt lis\_array\_shift()}, respectively.
\end{enumerate}
  
\section*{Changes from Version 1.7}
\begin{enumerate}
\item Addition: Support for multiple-step linear equations.
\item Names of the flags {\tt -ssor\_w} and {\tt -hybrid\_w} to {\tt -ssor\_omega}
and {\tt -hybrid\_omega}, respectively.
\end{enumerate}

\section*{Changes from Version 1.8}
\begin{enumerate}
\item Addition: Support for linear solvers generalized for complex arithmetic.
\item Addition: Support for unsymmetric eigenvalue problems.
\item Change: Definition of the Hermition inner product $(x,y)=y^{H}x$ to $(x,y)=x^{H}y$.
\item Change: Names and definitions of the functions 
      {\tt lis\_matvect*()},
      {\tt lis\_array\_matvect*()}, \\
      {\tt lis\_matrix\_solvet*()}, and 
      {\tt lis\_psolvet*()} for $A^T$, to 
      {\tt lis\_matvech*()}, 
      {\tt lis\_array\_matvech*()}, \\
      {\tt lis\_matrix\_solveh*()}, and 
      {\tt lis\_psolveh*()} for $A^H$, respectively.
\item Change: Name of the function {\tt lis\_matrix\_shift\_general()} to
{\tt lis\_matrix\_shift\_matrix()}. 
\end{enumerate}

\newpage
\section{Introduction}
Lis (Library of Iterative Solvers for linear systems, pronounced [lis]) 
is a parallel software library for solving discretized linear equations
\[
 Ax = b
\]
and eigenvalue problems
\[
 Ax = \lambda Bx
\]
that arise in the numerical solution of
partial differential equations using iterative methods\cite{nishida}.
The solvers available in Lis are listed in Table \ref{tab:solvers} and
\ref{tab:esolvers}, and the preconditioners are listed in Table \ref{tab:precon}.
The supported matrix storage formats are listed in Table \ref{tab:storage}.

\begin{table}[htb]
\begin{minipage}[t]{0.50\textwidth}
\caption{Linear Solvers} 
\vspace*{1mm}
\label{tab:solvers}
\hbox to\hsize{\hfil
\begin{tabular}{l|l}\hline\hline
CG\cite{hestenes,lanczos1} & CR\cite{hestenes} \\ 
BiCG\cite{fletcher,joly,pocock} & BiCR\cite{sogabe09} \\
CGS\cite{sonneveld}     & CRS\cite{abe02} \\
BiCGSTAB\cite{bicgstab} & BiCRSTAB\cite{abe02} \\
GPBiCG\cite{zhang}      & GPBiCR\cite{abe02} \\
BiCGSafe\cite{fujino01} & BiCRSafe\cite{fujino02} \\
BiCGSTAB(l)\cite{bicgstabl} & TFQMR\cite{tfqmr} \\
Jacobi\cite{jacobi}     & Orthomin(m)\cite{orthomin} \\
Gauss-Seidel\cite{gauss,seidel} & GMRES(m)\cite{gmres} \\
SOR\cite{young,frankel} & FGMRES(m)\cite{fgmres} \\
IDR(s)\cite{idrs}       & MINRES\cite{minres} \\
COCG\cite{cocg}         & COCR\cite{cocr} \\
\hline         
\end{tabular}
\hfil}
\end{minipage}
\hspace*{-8mm}
\begin{minipage}[t]{0.30\textwidth}
\caption{Eigensolvers} 
\vspace*{1mm}
\label{tab:esolvers}
\hbox to\hsize{\hfil
\begin{tabular}{l}\hline\hline
Power\cite{power} \\
Inverse\cite{inverse} \\
Rayleigh Quotient\cite{rayleigh} \\
CG\cite{knyazev} \\
CR\cite{suetomi} \\
Subspace\cite{rutishauser} \\
Lanczos\cite{lanczos2} \\
Arnoldi\cite{arnoldi} \\
\hline         
\end{tabular}
\hfil}
\end{minipage}
\newline
\begin{minipage}[t]{0.35\textwidth}
\caption{Preconditioners} 
\vspace*{1mm}
\label{tab:precon}
\hbox to\hsize{\hfil
\begin{tabular}{l}\hline\hline
Jacobi\cite{axelsson} \\
SSOR\cite{axelsson} \\
ILU(k)\cite{gustafsson,nakajima} \\
ILUT\cite{ilut,ITSOL} \\
Crout ILU\cite{ITSOL,iluc} \\
I+S\cite{kohno01} \\
SA-AMG\cite{fujii01}  \\
Hybrid\cite{abe01} \\
SAINV\cite{bridson01}  \\
Additive Schwarz\cite{chan,dryja} \\
User defined \\
\hline         
\end{tabular}
\hfil}
\end{minipage}
\hspace*{-4mm}
\begin{minipage}[t]{0.35\textwidth}
\caption{Matrix Storage Formats} 
\vspace*{1mm}
\label{tab:storage}
\hbox to\hsize{\hfil
\begin{tabular}{ll}\hline\hline
Compressed Sparse Row & (CSR) \\
Compressed Sparse Column & (CSC) \\
Modified Compressed Sparse Row & (MSR) \\
Diagonal &(DIA) \\
Ellpack-Itpack Generalized Diagonal &(ELL) \\
Jagged Diagonal &(JAD) \\
Block Sparse Row & (BSR) \\
Block Sparse Column &(BSC) \\
Variable Block Row &(VBR) \\
Coordinate & (COO) \\
Dense &	(DNS) \\
\hline         
\end{tabular}
\hfil}
\end{minipage}
\end{table}

\newpage
\section{Installation}
This section describes the instructions for installing and testing Lis. 

\subsection{System Requirements}
The installation of Lis requires a C compiler. The Fortran interface
requires a Fortran compiler, and the
algebraic multigrid preconditioner requires a Fortran 90 compiler.
For parallel computing environments, an OpenMP\cite{OpenMP} or 
MPI-1\cite{MPI} library is used\cite{kota1,kota2}.
Both the Harwell-Boeing\cite{duff92} and 
Matrix Market\cite{matrixmarket} formats are supported to import and
export user data. 
Lis has been tested in the environments listed in Table \ref{platforms}
(see also Table \ref{targetoption}). 

\begin{table}[htbp]
\caption{Major Tested Platforms}
\label{platforms}
\begin{center}
{\small
 \begin{tabular}{l|l}
\hline
\multicolumn{1}{c|}{C Compilers} & \multicolumn{1}{c}{OS} \\
\hline
Intel C/C++ Compiler 7.0, 8.0, 9.1, 10.1, 11.1, 12.1, 14.0, 16.0, 17.0, 18.0, 19.0 & Linux \\
                                                     & Windows  \\
\hline
IBM XL C/C++ V7.0, 9.0                     & AIX     \\
                                           & Linux   \\
\hline
Sun WorkShop 6, Sun ONE Studio 7,          & Solaris \\
Sun Studio 11, 12                          &         \\
\hline
PGI C++ 6.0, 7.1, 10.5, 16.10              & Linux \\
\hline
gcc 3.3, 4.4, 5.4, 6.4, 8.2                & Linux \\
                                           & Mac OS X \\
                                           & Windows \\
\hline
Microsoft Visual C++ 2008, 2010, 2012, 2013, 2015, 2017, 2019 & Windows \\
\hline
\hline
\multicolumn{1}{c|}{Fortran Compilers (Optional)} & \multicolumn{1}{c}{OS} \\
\hline
Intel Fortran Compiler 8.1, 9.1, 10.1, 11.1, 12.1, 14.0, 16.0, 17.0, 18.0, 19.0 & Linux \\
                                                  & Windows  \\
\hline
IBM XL Fortran V9.1, 11.1                  & AIX     \\
                                           & Linux   \\
\hline
Sun WorkShop 6, Sun ONE Studio 7,          & Solaris \\
Sun Studio 11, 12                          &         \\
\hline
PGI Fortran 6.0, 7.1, 10.5, 16.10          & Linux \\
\hline
g77 3.3                                    & Linux \\
gfortran 4.4, 5.4, 6.4, 8.2                & Mac OS X \\
                                           & Windows \\
\hline
\end{tabular}
}
\end{center}
\end{table} 

\subsection{Installing on UNIX and Compatible Systems}
\subsubsection{Extracting Archive}
Enter the following command to extract the archive, 
where \verb|($VERSION)| represents the version:\\
 \verb&      > unzip lis-($VERSION).zip &\\
This creates a directory {\tt lis-(\$VERSION)} together 
with its subfolders as shown in Figure \ref{listargz}.

\begin{figure}[htbp]
\begin{center}
\begin{verbatim}
lis-($VERSION)
 + config
 |  configuration files
 + doc
 |  documents
 + graphics
 |  sample files for graphics
 + include
 |  header files
 + src
 |  source files
 + test
 |  test programs
 + win
    configuration files for Windows systems
\end{verbatim}
\end{center}
\caption{Files contained in {\tt lis-(\$VERSION).zip}}
\label{listargz}
\end{figure}

\subsubsection{Configuring Source Tree}
 In the directory {\tt lis-(\$VERSION)}, run the following command to configure the source tree:
 \begin{itemize}
\item default: \verb&      > ./configure&
\item specify the installation destination: \verb&      > ./configure --prefix=<install-dir>&
\end{itemize}
Table \ref{configoption} shows the major options that can be specified for
the configuration, and 
Table \ref{targetoption} shows the major computing environments that can be specified 
by \verb+TARGET+. 
\begin{table}[htbp]
\caption{Major Configuration Options (see {\tt ./configure --help} for
 the complete list)}
\label{configoption}
\begin{center}
\begin{tabular}{|l|l|}
\hline
\verb+--enable-omp+      & Build with OpenMP library\\ \hline
\verb+--enable-mpi+      & Build with MPI library\\ \hline
\verb+--enable-fortran+  & Enable FORTRAN 77 compatible interface\\ \hline
\verb+--enable-f90+      & Enable Fortran 90 compatible interface\\ \hline
\verb+--enable-saamg+    & Enable SA-AMG preconditioner\\ \hline
\verb+--enable-quad+     & Enable double-double (quadruple)
 precision support\\ \hline
\verb+--enable-longdouble+ & Enable long double (quadruple)
 precision support\\ \hline
\verb+--enable-longlong+ & Enable 64bit integer support\\ \hline
\verb+--enable-complex+  & Enable complex scalar support\\ \hline 
\verb+--enable-debug+    & Enable debugging\\ \hline
\verb+--enable-shared+   & Enable dynamic linking\\ \hline
\verb+--enable-gprof+    & Enable profiling\\ \hline
\verb+--prefix=<install-dir>+    & Specify installation destination\\ \hline
\verb+TARGET=<target>+   & Specify computing environment\\ \hline
\verb+CC=<c_compiler>+   & Specify C compiler\\ \hline
\verb+CFLAGS=<c_flags>+    & Specify options for C compiler\\ \hline
\verb+F77=<f77_compiler>+    & Specify FORTRAN 77 compiler\\ \hline
\verb+F77FLAGS=<f77_flags>+    & Specify options for FORTRAN 77 compiler\\ \hline
\verb+FC=<f90_compiler>+    & Specify Fortran 90 compiler\\ \hline
\verb+FCFLAGS=<f90_flags>+    & Specify options for Fortran 90 compiler\\ \hline
\verb+LDFLAGS=<ld_flags>+    & Specify link options\\ \hline
\end{tabular}
\end{center}
\end{table}
\begin{table}[htbp]
\caption{Examples of Targets (see {\tt lis-(\$VERSION)/configure.ac} for details)}
\label{targetoption}
\begin{center}
\begin{tabular}{|l|l|}
\hline
\verb+<target>+           & Equivalent options \\ \hline
\verb+cray_xt3_cross+     & \verb+./configure CC=cc FC=ftn CFLAGS="-O3 -B -fastsse -tp k8-64"+ \\
                          & \verb+  FCFLAGS="-O3 -fastsse -tp k8-64 -Mpreprocess" FCLDFLAGS="-Mnomain"+\\
                          & \verb+  ac_cv_sizeof_void_p=8 cross_compiling=yes+\\
                          & \verb+  ax_f77_mangling="lower case, no underscore, extra underscore"+ \\ \hline
\verb+fujitsu_fx10_cross+ & \verb|./configure CC=fccpx FC=frtpx CFLAGS="-Kfast,ocl,preex"| \\
                          & \verb+  FCFLAGS="-Kfast,ocl,preex -Cpp -fs" FCLDFLAGS="-mlcmain=main"+\\
                          & \verb+  ac_cv_sizeof_void_p=8 cross_compiling=yes+\\
                          & \verb+  ax_f77_mangling="lower case, underscore, no extra underscore"+ \\ \hline
\verb+hitachi_sr16k+      & \verb|./configure CC=cc FC=f90 CFLAGS="-Os -noparallel"| \\
                          & \verb+  FCFLAGS="-Oss -noparallel" FCLDFLAGS="-lf90s"+ \\
                          & \verb+  ac_cv_sizeof_void_p=8+ \\
                          & \verb+  ax_f77_mangling="lower case, underscore, no extra underscore" + \\ \hline
\verb+ibm_bgl_cross+      & \verb+./configure CC=blrts_xlc FC=blrts_xlf90+ \\
                          & \verb+  CFLAGS="-O3 -qarch=440d -qtune=440 -qstrict"+ \\
                          & \verb+  FCFLAGS="-O3 -qarch=440d -qtune=440 -qsuffix=cpp=F90"+ \\
                          & \verb+  ac_cv_sizeof_void_p=4 cross_compiling=yes+\\
& \verb+  ax_f77_mangling="lower case, no underscore, no extra underscore"+ \\ \hline
\verb+intel_mic_cross+    & \verb+./configure CC=icc F77=ifort FC=ifort+ \\
                          & \verb+  MPICC=mpiicc MPIF77=mpiifort MPIFC=mpiifort+ \\
                          & \verb+  CFLAGS="-mmic" FFLAGS="-mmic" FCFLAGS="-mmic"+ \\
                          & \verb+  LDFLAGS="-mmic" FCLDFLAGS="-mmic" cross_compiling=yes+ \\
                          & \verb+  host=x86_64-pc-linux-gnu host_alias=x86_64-linux-gnu+ \\
                          & \verb+  host_cpu=x86_64 host_os=linux-gnu host_vendor=pc+ \\
                          & \verb+  target=k1om-mpss-linux-gnu target_alias=k1om-mpss-linux+ \\
                          & \verb+  target_cpu=k1om target_os=linux-gnu target_vendor=mpss+ \\
\hline
\verb+nec_sx9_cross+      & \verb|./configure CC=sxmpic++ FC=sxmpif90 AR=sxar RANLIB=true | \\
                          & \verb+  ac_cv_sizeof_void_p=8 ax_vector_machine=yes cross_compiling=yes+ \\ 
                          & \verb+  ax_f77_mangling="lower case, no underscore, extra underscore"+ \\ \hline
\end{tabular}
\end{center}
\end{table}

\subsubsection{Compiling}
In the directory {\tt lis-(\$VERSION)}, run the following command to generate
the executable files: \\
 \verb+      > make +\\
To ensure that the library has been built successfully, enter 
\\
 \verb+      > make check+\\
in {\tt lis-(\$VERSION)}. 
This runs a test script using the executable files created 
in {\tt lis-(\$VERSION)/test}, which reads 
the data of the coefficient matrix and the right-hand side vector 
from the file 
{\tt test/testmat.mtx} and solve the linear equation $Ax = b$ 
by the BiCG method. The result on the SGI Altix 3700 is
 shown below. Options {\tt --enable-omp} and {\tt --enable-mpi} can be combined.
\begin{itemsquarebox}[l]{Default}
 \begin{minipage}{10cm}
 \begin{verbatim}
matrix size = 100 x 100 (460 nonzero entries)

initial vector x      : all components set to 0
precision             : double
linear solver         : BiCG
preconditioner        : none
convergence condition : ||b-Ax||_2 <= 1.0e-12 * ||b-Ax_0||_2
matrix storage format : CSR
linear solver status  : normal end

BiCG: number of iterations = 15 (double = 15, quad = 0)
BiCG: elapsed time         = 5.178690e-03 sec.
BiCG:   preconditioner     = 1.277685e-03 sec. 
BiCG:     matrix creation  = 1.254797e-03 sec.
BiCG:   linear solver      = 3.901005e-03 sec.
BiCG: relative residual    = 6.327297e-15
 \end{verbatim}
 \end{minipage}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{{\tt --enable-omp}}
 \begin{minipage}{10cm}
 \begin{verbatim}
max number of threads = 32
number of threads = 2
matrix size = 100 x 100 (460 nonzero entries)

initial vector x      : all components set to 0
precision             : double
linear solver         : BiCG
preconditioner        : none
convergence condition : ||b-Ax||_2 <= 1.0e-12 * ||b-Ax_0||_2
matrix storage format : CSR
linear solver status  : normal end

BiCG: number of iterations = 15 (double = 15, quad = 0)
BiCG: elapsed time         = 8.960009e-03 sec.
BiCG:   preconditioner     = 2.297878e-03 sec. 
BiCG:     matrix creation  = 2.072096e-03 sec.
BiCG:   linear solver      = 6.662130e-03 sec.
BiCG: relative residual    = 6.221213e-15
 \end{verbatim}
 \end{minipage}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{\tt --enable-mpi}
 \begin{minipage}{10cm}
 \begin{verbatim}
number of processes = 2
matrix size = 100 x 100 (460 nonzero entries)

initial vector x      : all components set to 0
precision             : double
linear solver         : BiCG
preconditioner        : none
convergence condition : ||b-Ax||_2 <= 1.0e-12 * ||b-Ax_0||_2
matrix storage format : CSR
linear solver status  : normal end

BiCG: number of iterations = 15 (double = 15, quad = 0)
BiCG: elapsed time         = 2.911400e-03 sec.
BiCG:   preconditioner     = 1.560780e-04 sec. 
BiCG:     matrix creation  = 1.459997e-04 sec.
BiCG:   linear solver      = 2.755322e-03 sec.
BiCG: relative residual    = 6.221213e-15
 \end{verbatim}
 \end{minipage}
\end{itemsquarebox}

\subsubsection{Installing}
In the directory {\tt lis-(\$VERSION)}, enter\\
 \verb+      > make install+\\
which copies the files to the destination directory as follows:

\begin{verbatim}
($INSTALLDIR)
 +bin
 |   +lsolve esolve esolver gesolve gesolver hpcg_kernel hpcg_spmvtest spmvtest*
 +include
 |   +lis_config.h lis.h lisf.h
 +lib
 |   +liblis.a
 +share
     +doc/lis examples/lis man
\end{verbatim}

{\tt lis\_config.h} is the header file required to build the library, and 
{\tt lis.h} and {\tt lisf.h} are the header files required 
by the C and Fortran compilers, respectively. 
{\tt liblis.a} is the library.
To ensure that the library has been installed successfully, enter\\
 \verb+      > make installcheck+\\
in {\tt lis-(\$VERSION)}.
This runs a test script using the executable files installed 
in {\tt examples/lis}. 
{\tt test1}, {\tt etest5}, {\tt etest5b}, {\tt getest5}, {\tt getest5b}, {\tt test3b}, and {\tt spmvtest3b} 
in {\tt examples/lis} 
are copied in \\
{\tt (\$INSTALLDIR)/bin} as {\tt lsolve}, {\tt esolve}, {\tt esolver}, 
{\tt gesolve}, {\tt gesolver}, {\tt hpcg\_kernel}, and {\tt hpcg\_spmvtest}, respectively. {\tt examples/lis/spmvtest*} are also copied in 
{\tt (\$INSTALLDIR)/bin}.

To remove the copied files in {\tt (\$INSTALLDIR)}, enter 
\\
 \verb+      > make uninstall+\\
To remove the generated library and executable files
in {\tt lis-(\$VERSION)}, enter 
\\
 \verb+      > make clean+\\
To remove the configuration files in addition to the other
generated files, enter 
\\
 \verb+      > make distclean+

\subsection{Installing on Windows Systems}
Use an appropriate tool to extract the archive. 
To use the Microsoft Build Engine, run the following command in the directory 
{\tt lis-(\$VERSION)\textbackslash win} 
and generate the configuration file {\tt Makefile} (See {\tt configure.bat --help} 
for details): \\
 \verb+      > configure.bat+\\
The default configuration of {\tt Makefile} is defined in {\tt Makefile.in}.
To build the library, run the following command in the directory {\tt
lis-(\$VERSION)\textbackslash win}:\\
 \verb+      > nmake+\\
To ensure that the library has been built successfully, enter\\
 \verb+      > nmake check+\\
The following command copies
the library to {\tt (\$INSTALLDIR)\textbackslash lib}, 
the executable files to
{\tt (\$INSTALLDIR)\textbackslash bin},
the header files to
{\tt (\$INSTALLDIR)\textbackslash include},
and the PDF documents to
{\tt (\$INSTALLDIR)\textbackslash doc},
respectively:\\
 \verb+      > nmake install+\\
To remove the copied files in {\tt (\$INSTALLDIR)}, enter\\
 \verb+      > nmake uninstall+\\
To remove the generated library and executables files in
{\tt lis-(\$VERSION)\textbackslash win}, enter\\
 \verb+      > nmake clean+\\
To remove the configuration files in addition to the other
generated files, enter\\
\verb+      > nmake distclean+

To use UNIX compatible environments, follow the instructions in the
previous section. 

\subsection{Testing}

Test programs are located in {\tt lis-(\$VERSION)/test}.

\subsubsection{test1}

\verb+Usage: test1 matrix_filename rhs_setting solution_filename rhistory_filename [options]+\\

This program inputs the data of the coefficient matrix from {\tt matrix\_filename} and solves the linear equation $Ax=b$ with 
the solver specified by {\tt options}. 
It outputs the solution to 
{\tt solution\_filename} in the extended 
Matrix Market format and 
the residual history to {\tt rhistory\_filename} in the PLAIN format (see Appendix).
Both the extended Matrix Market format and the Harwell-Boeing format are
supported for {\tt matrix\_filename}. 
One of the following values can be specified by {\tt rhs\_setting}:
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[0] Use the right-hand side vector $b$ included in the data file
\item[1] Use $b = (1,\dots,1)^T$
\item[2] Use $b = A \times (1,\dots,1)^T$
\item[\tt rhs\_filename] The filename for the right-hand side vector 
\end{namelist}
The PLAIN and Matrix Market formats are supported for {\tt rhs\_filename}. 
{\tt test1f.F} is the Fortran version of {\tt test1.c}.

\subsubsection{test2}

\verb+Usage: test2 m n matrix_type solution_filename rhistory_filename [options]+\\

This program solves the linear equation $Ax = b$, where the coefficient 
matrix $A$ of size $mn$ is a discretized two dimensional 
Laplacian using the five
point central difference scheme, with the coefficient matrix 
in the storage format specified
by \verb|matrix_type| and the solver specified by {\tt options}. 
It outputs the solution to {\tt solution\_filename} in the extended 
Matrix Market format and 
the residual history to {\tt rhistory\_filename} in the PLAIN format. 
The right-hand side vector $b$ is set such that the values of the elements
of the solution $x$ are $1$. 
The values {\tt m} and  {\tt n} represent the numbers of grid points
in each dimension. 
{\tt test2f.F90} is the Fortran 90 version of {\tt test2.c}.

\subsubsection{test2b}

\verb+Usage: test2b m n matrix_type solution_filename rhistory_filename [options]+\\

This program solves the linear equation $Ax = b$, where the coefficient 
matrix $A$ of size $mn$ is a discretized two dimensional 
Laplacian using the nine 
point central difference scheme, with the coefficient matrix 
in the storage format specified
by \verb|matrix_type| and the solver specified by {\tt options}. 
It outputs the solution to {\tt solution\_filename} in the extended 
Matrix Market format and 
the residual history to {\tt rhistory\_filename} in the PLAIN format. 
The right-hand side vector $b$ is set such that the values of the elements
of the solution $x$ are $1$. 
The values {\tt m} and  {\tt n} represent the numbers of grid points
in each dimension. 

\subsubsection{test3}

\verb+Usage: test3 l m n matrix_type solution_filename rhistory_filename [options]+\\

This program solves the linear equation $Ax = b$, where the coefficient 
matrix $A$ of size $lmn$ is a discretized three dimensional 
Laplacian using the seven
point central difference scheme, with the coefficient matrix 
in the storage format specified
by \verb|matrix_type| and the solver specified by {\tt options}. 
It outputs the solution to {\tt solution\_filename} in the extended 
Matrix Market format and 
the residual history to {\tt rhistory\_filename} in the PLAIN format. 
The right-hand side vector $b$ is set such that the values of the elements of the solution $x$ are $1$. 
The values {\tt l}, {\tt m} and {\tt n} represent the numbers of grid
points in each dimension. 

\subsubsection{test3b}

\verb+Usage: test3b l m n matrix_type solution_filename rhistory_filename [options]+\\

This program solves the linear equation $Ax = b$, where the coefficient 
matrix $A$ of size $lmn$ is a discretized three dimensional 
Laplacian using the twenty-seven
point central difference scheme, with the coefficient matrix 
in the storage format specified
by \verb|matrix_type| and the solver specified by {\tt options}. 
It outputs the solution to {\tt solution\_filename} in the extended 
Matrix Market format and 
the residual history to {\tt rhistory\_filename} in the PLAIN format. 
The right-hand side vector $b$ is set such that the values of the elements of the solution $x$ are $1$. 
The values {\tt l}, {\tt m} and {\tt n} represent the numbers of grid
points in each dimension. 

\subsubsection{test3c}

\verb+Usage: test3c l m n step [options]+\\

This program solves the linear equation $Ax = b$ for {\tt step} steps,
where the coefficient 
matrix $A$ of size $lmn$ is a discretized three dimensional 
Laplacian using the seven
point central difference scheme, with the coefficient matrix 
in the CSR format and the solver specified by {\tt options}.
The right-hand side vector $b$ is set such that the values of the elements of the solution $x$ are $1$. The values of the elements of the matrix and
the right-hand side vector are updated at every step.
The values {\tt l}, {\tt m} and {\tt n} represent the numbers of grid
points in each dimension. 

\subsubsection{test4}
This program solves the linear equation $Ax = b$ with a specified 
solver and a preconditioner, where $A$ is a tridiagonal matrix
\[
\left(
\begin{array}{ccccc}
2 & -1 &   &  &   \\
-1 & 2 & -1 &  &   \\
  & \ddots  & \ddots  & \ddots  &   \\
  &   & -1 & 2 & -1 \\
  &   &   & -1 & 2 \\
\end{array}
\right)
\]
of size $12$.
The right-hand side vector $b$ is set such that  
the values of the elements of the solution $x$ are $1$. 
{\tt test4f.F} is the Fortran version of {\tt test4.c}.

\subsubsection{test5}

\verb+Usage: test5 n gamma [options]+\\

This program solves a linear equation $Ax =b$, where $A$ is a Toeplitz matrix
\[
\left(
\begin{array}{cccccc}
2 & 1 &   &  &  & \\
0 & 2 & 1 &  &  & \\
\gamma & 0& 2 & 1 &  & \\
 & \ddots & \ddots & \ddots & \ddots & \\
 &  &   \gamma &0 &       2   & 1 \\
 &  &  &   \gamma & 0& 2 \\
\end{array}
\right)
\]
of size $n$, with the solver specified by {\tt options}. 
Note that the right-hand vector is set such that the values of the elements 
of the solution $x$ are $1$. 

\subsubsection{test6}

\verb+Usage: test6 m n+\\

{\tt test6.c} is the array version of {\tt test2.c}.
This program solves the linear equation $Ax = b$ using the direct method,
where the coefficient 
matrix $A$ of size $mn$ is a discretized two dimensional 
Laplacian using the five
point central difference scheme. 
The right-hand side vector $b$ is set such that the values of the elements
of the solution $x$ are $1$. 
The values {\tt m} and  {\tt n} represent the numbers of grid points
in each dimension. 
{\tt test6f.F90} is the Fortran 90 version of {\tt test6.c}.

\subsubsection{test7}

\verb+Usage: test7+\\

This program show examples of complex arithmetic.
{\tt test7f.F} is the Fortran version of {\tt test7.c}.

\subsubsection{test8f}

\verb+Usage: mpiexec -n m test8f+\\

This program solves a nonlinear partial differential equation
using the Newton-Raphson method, where the preconditioner is
updated separately from the solver (see Subsection \ref{subsec:psd}).

\subsubsection{etest1}

\verb+Usage: etest1 matrix_filename evector_filename rhistory_filename [options]+\\

This program inputs the matrix data from {\tt matrix\_filename} and
solves the standard eigenvalue problem $Ax=\lambda x$ with 
the solver specified by {\tt options}. 
It outputs the specified eigenvalue to the standard output, 
the associated eigenvector to {\tt evector\_filename} 
in the extended Matrix Market format, and 
the residual history to {\tt rhistory\_filename} 
in the PLAIN format.
Both the Matrix Market format and the Harwell-Boeing format are
supported for the matrix filename. 
{\tt etest1f.F} is the Fortran version of {\tt etest1.c}.
See {\tt etest5} for obtaining multiple eigenpairs.

\subsubsection{getest1}

\verb+Usage: getest1 matrix_a_filename matrix_b_filename evector_filename rhistory_filename +\\
\verb+ [options]+\\

This program inputs the matrix data from {\tt matrix\_a\_filename}
and {\tt matrix\_b\_filename}, and
solves the generalized eigenvalue problem $Ax=\lambda Bx$ with 
the solver specified by {\tt options}. 
It outputs the specified eigenvalue to the standard output, 
the associated eigenvector to {\tt evector\_filename} 
in the extended Matrix Market format, and 
the residual history to {\tt rhistory\_filename} 
in the PLAIN format.
Both the Matrix Market format and the Harwell-Boeing format are
supported for the matrix filenames. 
See {\tt getest5} for obtaining multiple eigenpairs.

\subsubsection{etest2}

\verb+Usage: etest2 m n matrix_type evector_filename rhistory_filename [options]+\\

This program solves the eigenvalue problem $Ax = \lambda x$, where the 
coefficient matrix $A$ of size $mn$ is a discretized two dimensional Laplacian using the five
point central difference scheme, with the coefficient matrix in the storage format specified
by \verb|matrix_type| and the solver specified by {\tt options}. 
It outputs the specified eigenvalue to the standard output, 
the associated eigenvector to {\tt evector\_filename} in the
extended Matrix Market format, and 
the residual history to {\tt rhistory\_filename} 
in the PLAIN format. 
The values {\tt m} and {\tt n} represent the numbers of grid points
in each dimension. 

\subsubsection{etest3}

\verb+Usage: etest3 l m n matrix_type evector_filename rhistory_filename [options]+\\

This program solves the eigenvalue problem $Ax = \lambda x$, where the 
coefficient matrix $A$ of size $lmn$ is a discretized three dimensional Laplacian using the seven
point central difference scheme, with the coefficient matrix in the storage format specified
by \verb|matrix_type| and the solver specified by {\tt options}. 
It outputs the specified eigenvalue to the standard output, 
the associated eigenvector to {\tt evector\_filename} in the
extended Matrix Market format, and
the residual history to {\tt rhistory\_filename} 
in the PLAIN format. 
The values {\tt l}, {\tt m} and {\tt n} represent the numbers of grid
points in each dimension. 
See {\tt etest6} for obtaining multiple eigenpairs.

\subsubsection{etest4}

\verb+Usage: etest4 n [options]+\\

This program solves the eigenvalue problem $Ax = \lambda x$ with a specified 
solver, where $A$ is a tridiagonal matrix
\[
A = 
\left(
\begin{array}{ccccc}
2 & -1 &   &  &   \\
-1 & 2 & -1 &  &   \\
  & \ddots  & \ddots  & \ddots  &   \\
  &   & -1 & 2 & -1 \\
  &   &   & -1 & 2 \\
\end{array}
\right)
\]
of size $n \times n$.
{\tt etest4f.F} is the Fortran version of {\tt etest4.c}.

\subsubsection{etest5}

\verb+Usage: etest5 matrix_filename evalues_filename evectors_filename residuals_filename +\\
\verb+ iters_filename [options] +\\

This program inputs the matrix data from {\tt matrix\_filename} and
solves the standard eigenvalue problem $Ax=\lambda x$ with
the solver specified by {\tt options}. 
It outputs the specified number of eigenvalues,
the number of which is given by option \verb|-ss|, to 
{\tt evalues\_filename} and the associated 
eigenvectors, residual norms, and numbers of iterations  
to \\ {\tt evectors\_filename}, {\tt residuals\_filename}, 
and {\tt iters\_filename} respectively in the extended 
Matrix Market format.
Both the Matrix Market format and the Harwell-Boeing format are
supported for the matrix filename. 

\subsubsection{etest5b}

\verb+Usage: etest5b matrix_filename evalues_filename [options] +\\

This program inputs the matrix data from {\tt matrix\_filename} and
solves the standard eigenvalue problem $Ax=\lambda x$ with
the solver specified by {\tt options}. 
It outputs the specified number of Ritz values,
the number of which is given by option \verb|-ss|, to 
{\tt evalues\_filename} in the extended 
Matrix Market format.
Both the Matrix Market format and the Harwell-Boeing format are
supported for the matrix filename. 

\subsubsection{getest5}

\verb+Usage: getest5 matrix_a_filename matrix_b_filename evalues_filename evectors_filename +\\
\verb+ residuals_filename iters_filename [options] +\\

This program inputs the matrix data from {\tt matrix\_a\_filename} and
{\tt matrix\_b\_filename}, and solves the generalized eigenvalue problem
$Ax=\lambda Bx$ with the solver specified by {\tt options}. 
It outputs the specified number of eigenvalues,
the number of which is given by option \verb|-ss|, to 
{\tt evalues\_filename} and the associated 
eigenvectors, residual norms, and numbers of iterations  
to \\ {\tt evectors\_filename}, {\tt residuals\_filename}, 
and {\tt iters\_filename} respectively in the extended 
Matrix Market format.  
Both the Matrix Market format and the Harwell-Boeing format are
supported for the matrix filenames. 

\subsubsection{getest5b}

\verb+Usage: getest5b matrix_a_filename matrix_b_filename evalues_filename [options] +\\

This program inputs the matrix data from {\tt matrix\_a\_filename} and
{\tt matrix\_b\_filename}, and solves the generalized eigenvalue problem
$Ax=\lambda Bx$ with the solver specified by {\tt options}. 
It outputs the specified number of eigenvalues,
the number of which is given by option \verb|-ss|, to 
{\tt evalues\_filename} in the extended 
Matrix Market format.  
Both the Matrix Market format and the Harwell-Boeing format are
supported for the matrix filenames. 

\subsubsection{etest6}

\verb+Usage: etest6 l m n matrix_type evalues_filename evectors_filename residuals_filename +\\
\verb+ iters_filename [options] +\\

This program solves the eigenvalue problem $Ax = \lambda x$, where the 
coefficient matrix $A$ of size $lmn$ is a discretized three dimensional Laplacian using the seven
point central difference scheme, with the coefficient matrix in the storage format specified
by \verb|matrix_type| and the solver specified by {\tt options}. 
It outputs the specified number of eigenvalues,
the number of which is given by option \verb|-ss|, to 
{\tt evalues\_filename} and the associated 
eigenvectors and residual norms to {\tt evectors\_filename},  
{\tt residuals\_filename}, and {\tt iters\_filename} respectively 
in the extended Matrix Market format.
The values {\tt l}, {\tt m} and {\tt n} represent the numbers of grid
points in each dimension.

\subsubsection{etest7}

\verb+Usage: etest7 m n+\\

{\tt etest7.c} is the array version of {\tt etest2.c}.
This program solves the eigenvalue problem $Ax = \lambda x$ using
the QR algorithm, where the 
coefficient matrix $A$ of size $mn$ is a discretized two dimensional Laplacian using the five
point central difference scheme. 
The values {\tt m} and {\tt n} represent the numbers of grid points
in each dimension. 

\subsubsection{spmvtest1}

\verb+Usage: spmvtest1 n iter [matrix_type]+\\

This program computes the matrix-vector multiply of a discretized one dimensional Laplacian
\[
\left(
\begin{array}{ccccc}
2 & -1 &   &  &   \\
-1 & 2 & -1 &  &   \\
  & \ddots  & \ddots  & \ddots  &   \\
  &   & -1 & 2 & -1 \\
  &   &   & -1 & 2 \\
\end{array}
\right)
\]
of size $n$ using the three point central difference scheme
and a vector $(1,\dots,1)^T$.
The FLOPS performance is measured as the average of {\tt iter}
iterations.
If necessary, one of the following values can be specified by {\tt matrix\_type}:
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[0] Measure the performance for the available matrix storage formats
\item[1-11] The number of the matrix storage format
\end{namelist}

\subsubsection{spmvtest2}

\verb+Usage: spmvtest2 m n iter [matrix_type]+\\

This program computes the matrix-vector multiply of a 
discretized two dimensional Laplacian of size $mn$ using 
the five point central difference scheme 
and a vector $(1,\dots,1)^T$. 
The FLOPS performance is measured as the average of {\tt iter}
iterations.
If necessary, one of the following values can be specified by {\tt matrix\_type}:
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[0] Measure the performance for the available matrix storage formats
\item[1-11] The number of the matrix storage format
\end{namelist}
The values {\tt m} and {\tt n} represent the numbers of grid points 
in each dimension. 

\subsubsection{spmvtest2b}

\verb+Usage: spmvtest2b m n iter [matrix_type]+\\

This program computes the matrix-vector multiply of a 
discretized two dimensional Laplacian of size $mn$ using 
the nine point central difference scheme 
and a vector $(1,\dots,1)^T$. 
The FLOPS performance is measured as the average of {\tt iter}
iterations.
If necessary, one of the following values can be specified by {\tt matrix\_type}:
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[0] Measure the performance for the available matrix storage formats
\item[1-11] The number of the matrix storage format
\end{namelist}
The values {\tt m} and {\tt n} represent the numbers of grid points 
in each dimension. 

\subsubsection{spmvtest3}

\verb+Usage: spmvtest3 l m n iter [matrix_type]+\\

This program computes the matrix-vector multiply of a 
discretized three dimensional Laplacian of size $lmn$ using 
the seven point central difference scheme and a vector $(1,\dots,1)^T$. 
The values {\tt l}, {\tt m} and {\tt n} represent the numbers of grid
points in each dimension. 
The FLOPS performance is measured as the average of {\tt iter}
iterations.
If necessary, one of the following values can be specified by {\tt matrix\_type}:
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[0] Measure the performance for the available matrix storage formats
\item[1-11] The number of the matrix storage format
\end{namelist}

\subsubsection{spmvtest3b}

\verb+Usage: spmvtest3b l m n iter [matrix_type]+\\

This program computes the matrix-vector multiply of a 
discretized three dimensional Laplacian of size $lmn$ using 
the twenty-seven point central difference scheme and a vector $(1,\dots,1)^T$. 
The values {\tt l}, {\tt m} and {\tt n} represent the numbers of grid
points in each dimension. 
The FLOPS performance is measured as the average of {\tt iter}
iterations.
If necessary, one of the following values can be specified by {\tt matrix\_type}:
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[0] Measure the performance for the available matrix storage formats
\item[1-11] The number of the matrix storage format
\end{namelist}

\subsubsection{spmvtest4}

\verb+Usage: spmvtest4 matrix_filename_list iter [block]+\\

This program inputs the matrix data from the files listed in {\tt matrix\_filename\_list}, 
and computes the multiplies of matrices in available matrix 
storage formats and a vector $(1,\dots,1)^T$. 
The FLOPS performance is measured as the average of {\tt iter}
iterations.
Both the Matrix Market format and the Harwell-Boeing format are
supported for the matrix filenames. 
If necessary, the block size of the BSR and BSC formats can be specified
by {\tt block}.

\subsubsection{spmvtest5}

\verb+Usage: spmvtest5 matrix_filename matrix_type iter [block]+\\

This program inputs the matrix data from {\tt matrix\_filename} 
and compute the multiply of the matrix 
with \verb|matrix_type| and a vector $(1,\dots,1)^T$. 
The FLOPS performance is measured as the average of {\tt iter} iterations.
Both the Matrix Market format and the Harwell-Boeing format are
supported for {\tt matrix\_filename}. 
If necessary, the block size of the BSR and BSC formats can be specified by {\tt block}.

\subsection{Limitations}
The current version has the following limitations:
\begin{itemize}

\item Matrix storage formats
\begin{itemize}
\item The VBR format does not support the multiprocessing environment.
\item The SA-AMG preconditioner supports only the CSR format. 
\item In the multiprocessing environment, the CSR is the only accepted
      format for user defined arrays.
\end{itemize}

\item Double-double (quadruple) precision operations (see Section \ref{sec:quadruple})
\begin{itemize}
\item The Jacobi, Gauss-Seidel, SOR, IDR(s), COCG, and COCR methods
      do not support the double-double precision operations.
\item The eigensolvers do not support the double-double precision operations.
\item The Jacobi, Gauss-Seidel and SOR methods in the hybrid preconditioner do not support the double-double precision operations.
\item The I+S and SA-AMG preconditioners do not support the double-double precision operations.
\item The double-double precision operations does not support complex arithmetic.
\item The double-double precision operations cannot be combined with the long-double precision operations.
\end{itemize}

\item Preconditioners
\begin{itemize}
\item The algorithm of the ILU(k) preconditioner is based on the localized ILU preconditioning\cite{nakajima}, which factorizes the block diagonal elements in parallel. Note that the convergence behavior approaches to that of the Jacobi preconditioner as the number of threads or processes increases.
\item If a preconditioner other than the Jacobi or SSOR is selected 
      and matrix $A$ is not in the CSR format, a new matrix is created 
      in the CSR format for preconditioning.
\item The SA-AMG preconditioner does not support the BiCG method for unsymmetric matrices. 
\item The SA-AMG preconditioner does not support multithreading.
\item The SA-AMG preconditioner does not support complex arithmetic.   
\item The assembly of the matrices in the SAINV preconditioner is not parallelized.
\item The user defined preconditioner cannot be used.
\end{itemize}

\item Eigensolvers
\begin{itemize}
\item To compute complex eigenvalues, complex arithmetic must be enabled.
\end{itemize}

\end{itemize}
\vspace*{5mm}

\newpage
\section{Basic Operations}
This section describes how to use the library. 
A program requires the following statements:
\begin{itemize}
\item Initialization
\item Matrix creation
\item Vector creation
\item Solver creation
\item Value assignment for matrices and vectors
\item Solver assignment
\item Solver execution
\item Finalization
\end{itemize}
In addition, it must include one of the following compiler directives: 
\begin{itemize}
\item \verb+C       #include "lis.h"+
\item \verb+Fortran #include "lisf.h"+
\end{itemize}
When Lis is installed in \verb|($INSTALLDIR)|, {\tt lis.h} and {\tt lisf.h}
are located in \verb|($INSTALLDIR)/include|.

\subsection{Initializing and Finalizing}
The functions for initializing and finalizing the execution environment 
must be called at the top and bottom of the program, respectively, as follows:
\begin{itemsquarebox}[l]{C}
\small
\begin{verbatim}
 1: #include "lis.h"
 2: LIS_INT main(LIS_INT argc, char* argv[])
 3: {
 4:     lis_initialize(&argc, &argv);
 5:     ...
 6:     lis_finalize();
 7: }
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran}
\small
\begin{verbatim}
 1: #include "lisf.h"
 2:      call lis_initialize(ierr) 
 3:     ...
 4:      call lis_finalize(ierr)
\end{verbatim}
\end{itemsquarebox}
\\ \\
\noindent
{\bf Initializing}

For initializing, the following functions are used:
\begin{itemize}
\item \verb+C       LIS_INT lis_initialize(LIS_INT* argc, char** argv[])+
\item \verb+Fortran subroutine lis_initialize(LIS_INTEGER ierr)+
\end{itemize}
This function initializes the MPI execution environment, 
and specifies the options on the command line.

The default type of the integer in the C programs is {\tt LIS\_INT}, which
is equivalent to {\tt int}.  If the preprossor macro {\tt \_LONG\_\_LONG}
is defined, it is replaced with {\tt long long int}.
The default type of the integer in the Fortran programs is 
{\tt LIS\_INTEGER}, which is equivalent to {\tt integer}.  If the
preprocessor macro {\tt LONG\_\_LONG} is defined, it is replaced with 
{\tt integer*8}.
\\ \\
\noindent
{\bf Finalizing}

For finalizing, the following functions are used: 
\begin{itemize}
\item \verb+C       LIS_INT lis_finalize()+
\item \verb+Fortran subroutine lis_finalize(LIS_INTEGER ierr)+
\end{itemize}

\subsection{Operating Vectors}
Assume that the size of vector $v$ is $global\_n$, and the size 
of each partial vector stored on $nprocs$ processing elements is $local\_n$. 
If $global\_n$ is divisible, 
then $local\_n$ is equal to $global\_n$ $/$ $nprocs$. 
For example, when vector $v$ is stored on two processing elements, 
as shown in Equation (\ref{eq:vecv}), $global\_n$ and $local\_n$ 
are $4$ and $2$, respectively.
\begin{equation}
v = 
\left(
\begin{array}{c}
0 \\
1 \\ \hline
2 \\
3  
\end{array}
\right)
\begin{array}{l}
\mbox{PE0} \\
    \\
\mbox{PE1} \\
   \\ 
\end{array}
\label{eq:vecv}
\end{equation}

In the case of creating vector $v$ in Equation (\ref{eq:vecv}), 
vector $v$ itself is created for the serial and multithreaded environments, while 
the partial vectors are created and stored on a given number of processing elements
for the multiprocessing environment.
 
Programs to create vector $v$ are as follows, 
where the number of processing elements for the multiprocessing environment is assumed to be two:
\begin{itemsquarebox}[l]{C (for serial and multithreaded environments)}
\small
\begin{verbatim}
 1: LIS_INT i,n;
 2: LIS_VECTOR v;
 3: n = 4;
 4: lis_vector_create(0,&v);
 5: lis_vector_set_size(v,0,n);              /* or lis_vector_set_size(v,n,0); */ 
 6:
 7: for(i=0;i<n;i++)
 8: {
 9:     lis_vector_set_value(LIS_INS_VALUE,i,(double)i,v);
10: }
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{C (for multiprocessing environment)}
\small
\begin{verbatim}
 1: LIS_INT i,n,is,ie;                       /* or LIS_INT  i,ln,is,ie; */
 2: LIS_VECTOR v;
 3: n = 4;                                   /* ln = 2; */
 4: lis_vector_create(MPI_COMM_WORLD,&v);
 5: lis_vector_set_size(v,0,n);              /* lis_vector_set_size(v,ln,0); */
 6: lis_vector_get_range(v,&is,&ie);
 7: for(i=is;i<ie;i++)
 8: {
 9:     lis_vector_set_value(LIS_INS_VALUE,i,(double)i,v);
10: }
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran (for serial and multithreaded environments)}
\small
\begin{verbatim}
 1: LIS_INTEGER i,n
 2: LIS_VECTOR v
 3: n = 4
 4: call lis_vector_create(0,v,ierr)
 5: call lis_vector_set_size(v,0,n,ierr)  
 6:
 7: do i=1,n
 9:     call lis_vector_set_value(LIS_INS_VALUE,i,DBLE(i),v,ierr)
10: enddo
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran (for multiprocessing environment)}
\small
\begin{verbatim}
 1: LIS_INTEGER i,n,is,ie                 
 2: LIS_VECTOR v
 3: n = 4                                   
 4: call lis_vector_create(MPI_COMM_WORLD,v,ierr)
 5: call lis_vector_set_size(v,0,n,ierr)              
 6: call lis_vector_get_range(v,is,ie,ierr)
 7: do i=is,ie-1
 8:     call lis_vector_set_value(LIS_INS_VALUE,i,DBLE(i),v,ierr);
 9: enddo
\end{verbatim}
\end{itemsquarebox}
\\ \\
\noindent
{\bf Creating Vectors}

To create vector $v$, the following functions are used: 
\begin{itemize}
\item \verb|C       LIS_INT lis_vector_create(LIS_Comm comm, LIS_VECTOR *v)|
\item \verb|Fortran subroutine lis_vector_create(LIS_Comm comm, LIS_VECTOR v, LIS_INTEGER ierr)|
\end{itemize}
For the example program above, {\tt comm} must be replaced with the MPI communicator. 
For the serial and multithreaded environments, the value of {\tt comm} is ignored.
\\ \\
\noindent
{\bf Assigning Sizes}

To assign a size to vector $v$, the following functions are used: 
\begin{itemize}
\item \verb|C       LIS_INT lis_vector_set_size(LIS_VECTOR v, LIS_INT local_n, LIS_INT global_n)|
\item \verb|Fortran subroutine lis_vector_set_size(LIS_VECTOR v, LIS_INTEGER local_n,|\\
      \verb|         LIS_INTEGER global_n, LIS_INTEGER ierr)| 
\end{itemize}
Either $local\_n$ or $global\_n$ must be provided.

For the serial and multithreaded environments, $local\_n$ 
is equal to $global\_n$. 
Therefore, both \\
\verb|lis_vector_set_size(v,n,0)| and \verb|lis_vector_set_size(v,0,n)| create a vector of size $n$. 

For the multiprocessing environment, \verb|lis_vector_set_size(v,n,0)| 
creates a partial vector of size $n$ on each processing element. On the other hand, 
\verb|lis_vector_set_size(v,0,n)| creates a partial vector of size 
$m_p$ on processing element $p$. The values of $m_p$ are determined by the library. 
\\ \\
\noindent
{\bf Assigning Values}

To assign a value to the $i$-th element of vector $v$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_vector_set_value(LIS_INT flag, LIS_INT i, LIS_SCALAR value,|\\
      \verb|         LIS_VECTOR v)|
\item \verb|Fortran subroutine lis_vector_set_value(LIS_INTEGER flag, LIS_INTEGER i,|\\
      \verb|         LIS_SCALAR value, LIS_VECTOR v, LIS_INTEGER ierr)|
\end{itemize}
For the multiprocessing environment, the $i$-th row of the global vector must be
specified. 
Either
\begin{description}
\item[\tt LIS\_INS\_VALUE]: $v[i] = value$, or
\item[\tt LIS\_ADD\_VALUE]: $v[i] = v[i] + value$
\end{description}
must be provided for \verb+flag+.
\\ \\
\noindent
{\bf Duplicating Vectors}

To create a vector that has the same information as the existing vector, 
the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_vector_duplicate(LIS_VECTOR vin, LIS_VECTOR *vout)|
\item \verb|Fortran subroutine lis_vector_duplicate(LIS_VECTOR vin, LIS_VECTOR vout,|\\
      \verb|         LIS_INTEGER ierr)|
\end{itemize}
This function does not copy the values of the vector. 
To copy the values as well, the following functions must be called after the above functions:
\begin{itemize}
\item \verb|C       LIS_INT lis_vector_copy(LIS_VECTOR vsrc, LIS_VECTOR vdst)|
\item \verb|Fortran subroutine lis_vector_copy(LIS_VECTOR vsrc, LIS_VECTOR vdst,|\\
      \verb|         LIS_INTEGER ierr)| 
\end{itemize}
\noindent
{\bf Destroying Vectors}

To destroy the vector, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_vector_destroy(LIS_VECTOR v)|
\item \verb|Fortran subroutine lis_vector_destroy(LIS_VECTOR v,|\\
      \verb|         LIS_INTEGER ierr)|
\end{itemize}

\subsection{Operating Matrices}
Assume that the size of matrix $A$ is 
$global\_n$ $\times$ $global\_n$, and that the size of each row block
of matrix $A$ stored on $nprocs$ processing elements is 
$local\_n$ $\times$ $global\_n$. 
If $global\_n$ is divisible, 
then $local\_n$ is equal to $global\_n$ $/$ $nprocs$. 
For example, when the row block of matrix $A$ is stored on two
processing elements, 
as shown in Equation (\ref{eq:mat}), $global\_n$ and $local\_n$ 
are $4$ and $2$, respectively.

\begin{equation}
\label{eq:mat}
A = 
\left(
\begin{array}{cccc}
2 & 1 &   &    \\
1 & 2 & 1 &    \\ \hline
  & 1 & 2 & 1 \\
  &   & 1 & 2 
\end{array}
\right)
\begin{array}{l}
\mbox{PE0} \\
    \\
\mbox{PE1} \\
   \\ 
\end{array}
\end{equation}

A matrix in a specific storage format can be created in one of the
following three ways:\\ \\
\noindent
{\bf Method 1: Define Arrays in a Specific Storage Format with Library Functions}
\\ \\
\indent
For creating matrix $A$ in Equation (\ref{eq:mat}) in the CSR format, 
matrix $A$ itself is created for the serial and multithreaded environments,
while partial matrices are created and 
stored on the given number of processing elements 
for the multiprocessing environment.

Programs to create matrix $A$ in the CSR format are as follows, 
where the number of processing elements for the multiprocessing environment is assumed to be two:
\begin{itemsquarebox}[l]{C (for serial and multithreaded environments)}
\small
\begin{verbatim}
 1: LIS_INT i,n;
 2: LIS_MATRIX A;
 3: n = 4;
 4: lis_matrix_create(0,&A);
 5: lis_matrix_set_size(A,0,n);              /* or lis_matrix_set_size(A,n,0); */ 
 6: for(i=0;i<n;i++) {
 7:     if( i>0   ) lis_matrix_set_value(LIS_INS_VALUE,i,i-1,1.0,A);
 8:     if( i<n-1 ) lis_matrix_set_value(LIS_INS_VALUE,i,i+1,1.0,A);
 9:     lis_matrix_set_value(LIS_INS_VALUE,i,i,2.0,A);
10: }
11: lis_matrix_set_type(A,LIS_MATRIX_CSR);
12: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{C (for multiprocessing environment)}
\small
\begin{verbatim}
 1: LIS_INT i,n,gn,is,ie;                 
 2: LIS_MATRIX A;
 3: gn = 4;                                  /* or n=2 */
 4: lis_matrix_create(MPI_COMM_WORLD,&A);
 5: lis_matrix_set_size(A,0,gn);             /* lis_matrix_set_size(A,n,0); */
 6: lis_matrix_get_size(A,&n,&gn);
 7: lis_matrix_get_range(A,&is,&ie);
 8: for(i=is;i<ie;i++) {
 9:     if( i>0    ) lis_matrix_set_value(LIS_INS_VALUE,i,i-1,1.0,A);
10:     if( i<gn-1 ) lis_matrix_set_value(LIS_INS_VALUE,i,i+1,1.0,A);
11:     lis_matrix_set_value(LIS_INS_VALUE,i,i,2.0,A);
12: }
13: lis_matrix_set_type(A,LIS_MATRIX_CSR);
14: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran (for serial and multithreaded environments)}
\small
\begin{verbatim}
 1: LIS_INTEGER i,n
 2: LIS_MATRIX A
 3: n = 4
 4: call lis_matrix_create(0,A,ierr)
 5: call lis_matrix_set_size(A,0,n,ierr)
 6: do i=1,n
 7:     if( i>1 ) call lis_matrix_set_value(LIS_INS_VALUE,i,i-1,1.0d0,A,ierr)
 8:     if( i<n ) call lis_matrix_set_value(LIS_INS_VALUE,i,i+1,1.0d0,A,ierr)
 9:     call lis_matrix_set_value(LIS_INS_VALUE,i,i,2.0d0,A,ierr)
10: enddo
11: call lis_matrix_set_type(A,LIS_MATRIX_CSR,ierr)
12: call lis_matrix_assemble(A,ierr)
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran (for multiprocessing environment)}
\small
\begin{verbatim}
 1: LIS_INTEGER i,n,gn,is,ie                 
 2: LIS_MATRIX A
 3: gn = 4
 4: call lis_matrix_create(MPI_COMM_WORLD,A,ierr)
 5: call lis_matrix_set_size(A,0,gn,ierr)
 6: call lis_matrix_get_size(A,n,gn,ierr)
 7: call lis_matrix_get_range(A,is,ie,ierr)
 8: do i=is,ie-1
 9:     if( i>1  ) call lis_matrix_set_value(LIS_INS_VALUE,i,i-1,1.0d0,A,ierr)
10:     if( i<gn ) call lis_matrix_set_value(LIS_INS_VALUE,i,i+1,1.0d0,A,ierr)
11:     call lis_matrix_set_value(LIS_INS_VALUE,i,i,2.0d0,A,ierr)
12: enddo
13: call lis_matrix_set_type(A,LIS_MATRIX_CSR,ierr)
14: call lis_matrix_assemble(A,ierr)
\end{verbatim}
\end{itemsquarebox}
\\ \\
\noindent
{\bf Creating Matrices}

To create matrix $A$, the following functions are used: 
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_create(LIS_Comm comm, LIS_MATRIX *A)|
\item \verb|Fortran subroutine lis_matrix_create(LIS_Comm comm, LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}
{\tt comm} must be replaced with the MPI communicator. 
For the serial and multithreaded environments, the value of {\tt comm} is ignored.
\\ \\
\noindent
{\bf Assigning Sizes}

To assign a size to matrix $A$, the following functions are used: 
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_size(LIS_MATRIX A, LIS_INT local_n, LIS_INT global_n)|
\item \verb|Fortran subroutine lis_matrix_set_size(LIS_MATRIX A, LIS_INTEGER local_n,|\\
      \verb|         LIS_INTEGER global_n, LIS_INTEGER ierr)|
\end{itemize}
Either $local\_n$ or $global\_n$ must be provided. 

For the serial and multithreaded environments, $local\_n$ is
equal to $global\_n$. 
Therefore, both \\
\verb|lis_matrix_set_size(A,n,0)| and \verb|lis_matrix_set_size(A,0,n)|
create a matrix of size $n \times n$.

For the multiprocessing environment, \verb|lis_matrix_set_size(A,n,0)| creates
a partial matrix of size $n \times N$ on each processing element, 
where $N$ is the total sum of $n$. 
On the other hand, \\
\verb|lis_matrix_set_size(A,0,n)| creates 
a partial matrix of size $m_p \times n$ on processing element $p$.
The values of $m_p$ are determined by the library.
\\ \\
\noindent
{\bf Assigning Values}

To assign a value to the element at the $i$-th row and the $j$-th column of
matrix $A$, 
the following functions are used: 
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_value(LIS_INT flag, LIS_INT i, LIS_INT j,|\\
      \verb|         LIS_SCALAR value, LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_value(LIS_INTEGER flag, LIS_INTEGER i,|\\
      \verb|         LIS_INTEGER j, LIS_SCALAR value, LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}
For the multiprocessing environment, the $i$-th row and the $j$-th column of the global matrix 
must be specified. 
Either
\begin{description}
\item[\tt LIS\_INS\_VALUE]: $A(i,j) = value$, or
\item[\tt LIS\_ADD\_VALUE]: $A(i,j) = A(i,j) + value$
\end{description}
must be provided for the parameter \verb+flag+.
\\ \\
\noindent
{\bf Assigning Storage Formats}

To assign a storage format to matrix $A$, 
the following functions are used: 
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_type(LIS_MATRIX A, LIS_INT matrix_type)|
\item \verb|Fortran subroutine lis_matrix_set_type(LIS_MATRIX A, LIS_INTEGER matrix_type,|\\
      \verb|         LIS_INTEGER ierr)|
\end{itemize}
where \verb+matrix_type+ is \verb+LIS_MATRIX_CSR+ when the matrix is created. 
The following storage formats are supported:
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
\begin{tabular}{lll}\hline\hline
Storage format  & & \verb|matrix_type| \\ \hline
Compressed Sparse Row & (CSR) & \verb={LIS_MATRIX_CSR|1}= \\
Compressed Sparse Column & (CSC) & \verb={LIS_MATRIX_CSC|2}= \\
Modified Compressed Sparse Row & (MSR) & \verb={LIS_MATRIX_MSR|3}= \\
Diagonal &(DIA) & \verb={LIS_MATRIX_DIA|4}= \\
Ellpack-Itpack Generalized Diagonal &(ELL) & \verb={LIS_MATRIX_ELL|5}= \\
Jagged Diagonal &(JAD) & \verb={LIS_MATRIX_JAD|6}= \\
Block Sparse Row & (BSR) & \verb={LIS_MATRIX_BSR|7}= \\
Block Sparse Column &(BSC) & \verb={LIS_MATRIX_BSC|8}= \\
Variable Block Row &(VBR) & \verb={LIS_MATRIX_VBR|9}= \\
Coordinate & (COO) & \verb={LIS_MATRIX_COO|10}= \\
Dense &	(DNS) & \verb={LIS_MATRIX_DNS|11}= \\
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\ \\
\noindent
{\bf Assembling Matrices}

After assigning values and storage formats, the following functions must be called:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_assemble(LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_assemble(LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}
\verb|lis_matrix_assemble| assembles $A$ into the storage format specified by \verb|lis_matrix_set_type|.
\\ \\ 
\noindent
{\bf Destroying Matrices}

To destroy the matrix, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_destroy(LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_destroy(LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}
\vspace*{5mm}

\noindent
{\bf Method 2: Define Arrays in a Specific Storage Format Directly}\\
\\ 
\indent
For creating matrix $A$ in Equation (\ref{eq:mat}) in the
CSR format, 
matrix $A$ itself is created for the serial and multithreaded environments,
while the partial matrices are created and 
stored on the given number of processing elements 
for the multiprocessing environment.

Programs to create matrix $A$ in the CSR format are as follows,
where the number of processing elements for the multiprocessing environment is assumed to be two: 
\begin{itemsquarebox}[l]{C (for serial and multithreaded environments)}
\small
\begin{verbatim}
 1: LIS_INT i,k,n,nnz;
 2: LIS_INT *ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 10; k = 0;
 6: lis_matrix_malloc_csr(n,nnz,&ptr,&index,&value);
 7: lis_matrix_create(0,&A);
 8: lis_matrix_set_size(A,0,n);              /* or lis_matrix_set_size(A,n,0); */ 
 9: 
10: for(i=0;i<n;i++)
11: {
12:     if( i>0   ) {index[k] = i-1; value[k] = 1; k++;}
13:     index[k] = i; value[k] = 2; k++;
14:     if( i<n-1 ) {index[k] = i+1; value[k] = 1; k++;}
15:     ptr[i+1] = k;
16: }
17: ptr[0] = 0;
18: lis_matrix_set_csr(nnz,ptr,index,value,A);
19: lis_matrix_assemble(A); 


\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{C (for multiprocessing environment)}
\small
\begin{verbatim}
 1: LIS_INT i,k,n,nnz,is,ie;
 2: LIS_INT *ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 2; nnz = 5; k = 0;
 6: lis_matrix_malloc_csr(n,nnz,&ptr,&index,&value);
 7: lis_matrix_create(MPI_COMM_WORLD,&A);
 8: lis_matrix_set_size(A,n,0);
 9: lis_matrix_get_range(A,&is,&ie);
10: for(i=is;i<ie;i++)
11: {
12:     if( i>0   ) {index[k] = i-1; value[k] = 1; k++;}
13:     index[k] = i; value[k] = 2; k++;
14:     if( i<n-1 ) {index[k] = i+1; value[k] = 1; k++;}
15:     ptr[i-is+1] = k;
16: }
17: ptr[0] = 0;
18: lis_matrix_set_csr(nnz,ptr,index,value,A);
19: lis_matrix_assemble(A); 
\end{verbatim}
\end{itemsquarebox}
\\ \\
\noindent
{\bf Associating Arrays}

To associate the arrays in the CSR format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_csr(LIS_INT nnz, LIS_INT ptr[], LIS_INT index[],|\\
      \verb|         LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_csr(LIS_INTEGER nnz, LIS_INTEGER ptr(),|\\
      \verb|         LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}
\vspace*{5mm}

\noindent
{\bf Method 3: Read Matrix and Vector Data from External Files}\\
\\ \indent
Programs to read matrix $A$ in Equation (\ref{eq:mat}) in the CSR format and 
vector $b$ in Equation (\ref{eq:vecv}) from an external file are as follows: 
\\
\begin{itemsquarebox}[l]{C (for serial, multithreaded and multiprocessing environments)}
\small
\begin{verbatim}
 1: LIS_MATRIX A;
 2: LIS_VECTOR b,x;
 3: lis_matrix_create(LIS_COMM_WORLD,&A); 
 4: lis_vector_create(LIS_COMM_WORLD,&b); 
 5: lis_vector_create(LIS_COMM_WORLD,&x); 
 6: lis_matrix_set_type(A,LIS_MATRIX_CSR); 
 7: lis_input(A,b,x,"matvec.mtx"); 
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran (for serial, multithreaded and multiprocessing environments)}
\small
\begin{verbatim}
 1: LIS_MATRIX A
 2: LIS_VECTOR b,x
 3: call lis_matrix_create(LIS_COMM_WORLD,A,ierr) 
 4: call lis_vector_create(LIS_COMM_WORLD,b,ierr) 
 5: call lis_vector_create(LIS_COMM_WORLD,x,ierr) 
 6: call lis_matrix_set_type(A,LIS_MATRIX_CSR,ierr) 
 7: call lis_input(A,b,x,'matvec.mtx',ierr) 
\end{verbatim}
\end{itemsquarebox}
\\ \\
The content of the destination file {\tt matvec.mtx} is:
{\small
\begin{verbatim}
%%MatrixMarket matrix coordinate real general
4 4 10 1 0
1 2  1.0e+00
1 1  2.0e+00
2 3  1.0e+00
2 1  1.0e+00
2 2  2.0e+00
3 4  1.0e+00
3 2  1.0e+00
3 3  2.0e+00
4 4  2.0e+00
4 3  1.0e+00
1  0.0e+00
2  1.0e+00
3  2.0e+00
4  3.0e+00
\end{verbatim}
}

\noindent
{\bf Reading from External Files}

To input the matrix data for $A$ from an external file,
the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_input_matrix(LIS_MATRIX A, char *filename)|
\item \verb|Fortran subroutine lis_input(LIS_MATRIX A,|\\
      \verb|         character filename, LIS_INTEGER ierr)|
\end{itemize}
{\tt filename} must be replaced with the file path.
The following file formats are supported:

\begin{itemize}
\item The Matrix Market format
\item The Harwell-Boeing format
\end{itemize}

To read the data for matrix $A$ and vectors $b$ and $x$ from
external files, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_input(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x, char *filename)|
\item \verb|Fortran subroutine lis_input(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
      \verb|         character filename, LIS_INTEGER ierr)|
\end{itemize}
{\tt filename} must be replaced with the file path.
The following file formats are supported:

\begin{itemize}
\item The Extended Matrix Market format (extended to allow vector data)
\item The Harwell-Boeing format
\end{itemize}

\subsection{Solving Linear Equations}\label{subsec:solve}
A program to solve the linear equation $Ax = b$ with a specified 
solver is as follows: 
\begin{itemsquarebox}[l]{C (for serial, multithreaded and multiprocessing environments)}
\small
\begin{verbatim}
 1: LIS_MATRIX A; 
 2: LIS_VECTOR b,x; 
 3: LIS_SOLVER solver; 
 4:    
 5: /* Create matrix and vector */ 
 6:    
 7: lis_solver_create(&solver); 
 8: lis_solver_set_option("-i bicg -p none",solver); 
 9: lis_solver_set_option("-tol 1.0e-12",solver); 
10: lis_solve(A,b,x,solver); 
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran (for serial, multithreaded and multiprocessing environments)}
\small
\begin{verbatim}
 1: LIS_MATRIX A 
 2: LIS_VECTOR b,x 
 3: LIS_SOLVER solver 
 4:    
 5: /* Create matrix and vector */ 
 6:    
 7: call lis_solver_create(solver,ierr) 
 8: call lis_solver_set_option('-i bicg -p none',solver,ierr) 
 9: call lis_solver_set_option('-tol 1.0e-12',solver,ierr) 
10: call lis_solve(A,b,x,solver,ierr) 
\end{verbatim}
\end{itemsquarebox}
\\ \\
\noindent
{\bf Creating Solvers}

To create a solver, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_solver_create(LIS_SOLVER *solver)|
\item \verb|Fortran subroutine lis_solver_create(LIS_SOLVER solver, LIS_INTEGER ierr) |
\end{itemize}

\noindent
{\bf Specifying Options}

To specify options, 
the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_solver_set_option(char *text, LIS_SOLVER solver)|
\item \verb|Fortran subroutine lis_solver_set_option(character text, LIS_SOLVER solver,|\\
      \verb|         LIS_INTEGER ierr)|
\end{itemize}
or
\begin{itemize}
\item \verb|C       LIS_INT lis_solver_set_optionC(LIS_SOLVER solver)|
\item \verb|Fortran subroutine lis_solver_set_optionC(LIS_SOLVER solver, LIS_INTEGER ierr)|
\end{itemize}
\verb|lis_solver_set_optionC| is a function that sets the options specified 
on the command line, and passes them to \verb|solver| when the program is run. 

The table below shows the available command line options, 
where \verb=-i {cg|1}= means \verb=-i cg= or \verb=-i 1= and \verb=-maxiter [1000]= indicates that \verb=-maxiter= defaults to $1,000$.
\\
\\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Linear Solvers} (Default: \verb=-i bicg=) \\
\begin{tabular}{l|lll}\hline\hline
 Solver      & Option              &  Auxiliary Options  & \\ \hline
 CG          & \verb=-i {cg|1}=         &    \\ 
 BiCG        & \verb=-i {bicg|2}=       &    \\
 CGS         & \verb=-i {cgs|3}=        &    \\
 BiCGSTAB    & \verb=-i {bicgstab|4}=   &    \\
 BiCGSTAB(l) & \verb=-i {bicgstabl|5}=  & \verb=-ell [2]=      & The degree $l$ \\
 GPBiCG      & \verb=-i {gpbicg|6}=     &    \\
 TFQMR       & \verb=-i {tfqmr|7}=      &    \\
 Orthomin(m) & \verb=-i {orthomin|8}=   & \verb=-restart [40]= & The restart
 value $m$  \\
 GMRES(m)    & \verb=-i {gmres|9}=      & \verb=-restart [40]= & The restart value $m$  \\ 
 Jacobi      & \verb=-i {jacobi|10}=    &    \\
 Gauss-Seidel& \verb=-i {gs|11}=        &    \\
 SOR         & \verb=-i {sor|12}=       & \verb=-omega [1.9]=  & The relaxation coefficient \\
             &                          &                      & $\omega$ ($0<\omega<2$) \\
 BiCGSafe    & \verb=-i {bicgsafe|13}=     &    \\
 CR          & \verb=-i {cr|14}=        &    \\ 
 BiCR        & \verb=-i {bicr|15}=      &    \\
 CRS         & \verb=-i {crs|16}=       &    \\
 BiCRSTAB    & \verb=-i {bicrstab|17}=  &    \\
 GPBiCR      & \verb=-i {gpbicr|18}=    &    \\
 BiCRSafe    & \verb=-i {bicrsafe|19}=  &    \\
 FGMRES(m)   & \verb=-i {fgmres|20}=    & \verb=-restart [40]= & The restart value $m$   \\ 
 IDR(s)      & \verb=-i {idrs|21}=      & \verb=-irestart [2]= & The restart
 value $s$  \\
 IDR(1)      & \verb=-i {idr1|22}=      &    \\
 MINRES      & \verb=-i {minres|23}=    &    \\
 COCG        & \verb=-i {cocg|24}=      &    \\
 COCR        & \verb=-i {cocr|25}=      &    \\  
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Preconditioners} (Default: \verb=-p none=)\\
\begin{tabular}{l|lll}\hline\hline
Preconditioner   & Option           & Auxiliary Options \\ \hline
None     & \verb=-p {none|0}=    &   \\
Jacobi   & \verb=-p {jacobi|1}=  &     \\
ILU(k)   & \verb=-p {ilu|2}=     & \verb=-ilu_fill [0]=    & The fill level $k$ \\
SSOR     & \verb=-p {ssor|3}=    & \verb=-ssor_omega [1.0]= & The relaxation coefficient \\
         &                       &                          & $\omega$ ($0<\omega<2$) \\
Hybrid   & \verb=-p {hybrid|4}=  & \verb=-hybrid_i [sor]=  & The linear solver\\
         &                       & \verb=-hybrid_maxiter [25]= & The
 maximum number of iterations \\
         &                       & \verb=-hybrid_tol [1.0e-3]= & The convergence tolerance \\
         &                       & \verb=-hybrid_omega [1.5]=  & The
 relaxation coefficient $\omega$ \\
         &                       &                             & of the SOR ($0<\omega<2$) \\
         &                       & \verb=-hybrid_ell [2]=      & The
 degree $l$ of the BiCGSTAB(l) \\
         &                       & \verb=-hybrid_restart [40]= & The
 restart values \\
         &                       &                             & of the GMRES and Orthomin \\
I+S      & \verb=-p {is|5}=      & \verb=-is_alpha [1.0]=  &  The
 parameter $\alpha$ of $I+\alpha S^{(m)}$ \\
         &                       & \verb=-is_m [3]=        & The
 parameter $m$ of $I+\alpha S^{(m)}$ \\
SAINV    & \verb=-p {sainv|6}=   & \verb=-sainv_drop [0.05]=    & The drop criterion\\
SA-AMG   & \verb=-p {saamg|7}=   & \verb=-saamg_unsym [false]=    &
 Select the unsymmetric version    \\
         &                       &                             & (The matrix structure must be \\
         &                       &                             & symmetric)    \\
         &                       & \verb=-saamg_theta [0.05|0.12]= & The
 drop criterion $a^2_{ij}\le\theta^2|a_{ii}||a_{jj}|$ \\
         &                       &                             & (symmetric or unsymmetric) \\
Crout ILU& \verb=-p {iluc|8}=    & \verb=-iluc_drop [0.05]=    & The drop criterion    \\
         &                       & \verb=-iluc_rate [5.0]=     & The
 ratio of the maximum fill-in \\
ILUT     & \verb=-p {ilut|9}=    &     \\
Additive & \verb=-adds true=     & \verb=-adds_iter [1]=       & The number of iterations   \\
Schwarz  &                       &                             &                            \\
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Other Options}\\
\begin{tabular}{l|ll}\hline\hline
Option &                          \\ \hline
\verb=-maxiter [1000]= & The maximum number of iterations         \\ 
\verb=-tol [1.0e-12]=  & The convergence tolerance $tol$             \\
\verb=-tol_w [1.0]=    & The convergence tolerance $tol_w$  \\
\verb=-print [0]=      & The output of the residual history                \\
                       & \verb=-print {none|0}     =  None \\
                       & \verb=-print {mem|1}      =  Save the residual history\\
                       & \verb=-print {out|2}      =  Output it to the standard output\\
                       & \verb=-print {all|3}      =  Save the residual history and output it \\
                       & \verb=                    =  to the standard output\\
\verb=-scale [0]=      & The scaling \\
                       & (The result will overwrite the original matrix and vectors) \\
                       & \verb=-scale {none|0}     =  No scaling \\ 
                       & \verb=-scale {jacobi|1}   =  The Jacobi scaling $D^{-1}Ax=D^{-1}b$ \\
                       & \verb=                    =  ($D$ represents the diagonal of $A=(a_{ij})$)\\
                       & \verb=-scale {symm_diag|2}=  The diagonal scaling $D^{-1/2}AD^{-1/2}x=D^{-1/2}b$ \\
                       & \verb=                    =  ($D^{-1/2}$ represents the diagonal matrix \\
                       & \verb=                    =  with $1/\sqrt{a_{ii}}$ as the diagonal) \\ 
\verb=-initx_zeros [1]= & The behavior of the initial vector $x_{0}$  \\
                       & \verb=-initx_zeros {false|0}     =  The components are given by the argument \verb=x= \\
                       & \verb=                           =  of the function \verb=lis_solve()= \\
                       & \verb=-initx_zeros {true|1}      =  All the components are set to $0$ \\
\verb=-conv_cond [0]= & The convergence condition  \\
                       & \verb=-conv_cond {nrm2_r|0}     =  $||b-Ax||_2 \le tol * ||b-Ax_0||_2$ \\
                       & \verb=-conv_cond {nrm2_b|1}     =  $||b-Ax||_2 \le tol * ||b||_2$ \\
                       & \verb=-conv_cond {nrm1_b|2}     =  $||b-Ax||_1 \le tol_w * ||b||_1 + tol$\\
\verb=-omp_num_threads [t]= & The number of threads        \\ 
                            & (\verb=t= represents the maximum number of
 threads) \\
\verb=-storage [0]=    & The matrix storage format \\
\verb=-storage_block [2]=& The block size of the BSR and BSC formats\\ 
\verb=-f [0]=          & The precision of the linear solver\\
                       & \verb=-f {double|0}       =  Double precision \\ 
                       & \verb=-f {quad|1}         =  Double-double (quadruple) precision \\
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\ \\
\noindent
{\bf Solving Linear Equations}

To solve the linear equation $Ax = b$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_solve(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
      \verb|         LIS_SOLVER solver)|
\item \verb|Fortran subroutine lis_solve(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
      \verb|         LIS_SOLVER solver, LIS_INTEGER ierr)|
\end{itemize}

\subsection{Solving Eigenvalue Problems}\label{subsec:solve}
A program to solve the standard eigenvalue problem $Ax = \lambda x$ with a specified 
solver is as follows: 
\begin{itemsquarebox}[l]{C (for serial, multithreaded and multiprocessing environments)}
\small
\begin{verbatim}
 1: LIS_MATRIX A; 
 2: LIS_VECTOR x; 
 3: LIS_REAL evalue; 
 4: LIS_ESOLVER esolver; 
 5: 
 6: /* Create matrix and vector */ 
 7: 
 8: lis_esolver_create(&esolver); 
 9: lis_esolver_set_option("-e ii -i bicg -p none",esolver); 
10: lis_esolver_set_option("-etol 1.0e-12 -tol 1.0e-12",esolver); 
11: lis_esolve(A,x,evalue,esolver); 
\end{verbatim}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Fortran (for serial, multithreaded and multiprocessing environments)}
\small
\begin{verbatim}
 1: LIS_MATRIX A 
 2: LIS_VECTOR x 
 3: LIS_REAL evalue
 4: LIS_ESOLVER esolver 
 5:
 6: /* Create matrix and vector */ 
 7:
 8: call lis_esolver_create(esolver,ierr) 
 9: call lis_esolver_set_option('-e ii -i bicg -p none',esolver,ierr) 
10: call lis_esolver_set_option('-etol 1.0e-12 -tol 1.0e-12',esolver,ierr) 
11: call lis_esolve(A,x,evalue,esolver,ierr) 
\end{verbatim}
\end{itemsquarebox}
\\ \\
\noindent
{\bf Creating Eigensolvers}

To create an eigensolver, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_esolver_create(LIS_ESOLVER *esolver)|
\item \verb|Fortran subroutine lis_esolver_create(LIS_ESOLVER esolver, LIS_INTEGER ierr) |
\end{itemize}

\noindent
{\bf Specifying Options}

To specify options, 
the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_esolver_set_option(char *text, LIS_ESOLVER esolver)|
\item \verb|Fortran subroutine lis_esolver_set_option(character text, LIS_ESOLVER esolver,|\\
      \verb|         LIS_INTEGER ierr)|
\end{itemize}
or
\begin{itemize}
\item \verb|C       LIS_INT lis_esolver_set_optionC(LIS_ESOLVER esolver)|
\item \verb|Fortran subroutine lis_esolver_set_optionC(LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{itemize}
\verb|lis_esolver_set_optionC| is a function that sets the options specified 
in the command line, and passes them to \verb|esolver| when the program is run. 

The table below shows the available command line options, 
where \verb=-e {pi|1}= means \verb=-e pi= or \verb=-e 1= and \verb=-emaxiter [1000]= indicates 
that \verb=-emaxiter= defaults to $1,000$.
\\
\\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Eigensolvers} (Default: \verb=-e cr=) \\
\begin{tabular}{l|lll}\hline\hline
 Eigensolver      & Option              &  Auxiliary Options  & \\ \hline
\hline
 Power                             & \verb=-e {pi|1}=        &    \\ 
 Inverse                           & \verb=-e {ii|2}=        & 
 \verb=-i [bicg]= & The linear solver \\
 Rayleigh Quotient                 & \verb=-e {rqi|3}=       &
 \verb=-i [bicg]= & The linear solver \\
 CG                                & \verb=-e {cg|4}=        &
 \verb=-i [cg]= & The linear solver \\ 
 CR                                & \verb=-e {cr|5}=        &
 \verb=-i [bicg]= & The linear solver \\ 
 Subspace                          & \verb=-e {si|6}=        &
 \verb=-ss [1]= & The size of the subspace \\
 Lanczos                           & \verb=-e {li|7}=        &
 \verb=-ss [1]= & The size of the subspace \\
 Arnoldi                           & \verb=-e {ai|8}=        &
 \verb=-ss [1]= & The size of the subspace \\
 Generalized Power                 & \verb=-e {gpi|9}=      &
 \verb=-i [bicg]= & The linear solver \\ 
 Generalized Inverse               & \verb=-e {gii|10}=      & 
 \verb=-i [bicg]= & The linear solver \\
 Generalized Rayleigh Quotient     & \verb=-e {grqi|11}=      & 
 \verb=-i [bicg]= & The linear solver \\ 
 Generalized CG                    & \verb=-e {gcg|12}=      & 
 \verb=-i [cg]= & The linear solver \\
 Generalized CR                    & \verb=-e {gcr|13}=      & 
 \verb=-i [bicg]= & The linear solver \\
 Generalized Subspace              & \verb=-e {gsi|14}=      &
 \verb=-ss [1]= & The size of the subspace \\
 Generalized Lanczos               & \verb=-e {gli|15}=      &
 \verb=-ss [1]= & The size of the subspace \\
 Generalized Arnoldi               & \verb=-e {gai|16}=      &
 \verb=-ss [1]= & The size of the subspace \\  
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Preconditioners} (Default: \verb=-p none=)\\
\begin{tabular}{l|lll}\hline\hline
Preconditioner   & Option           & Auxiliary Options \\ \hline
None     & \verb=-p {none|0}=    &   \\
Jacobi   & \verb=-p {jacobi|1}=  &     \\
ILU(k)   & \verb=-p {ilu|2}=     & \verb=-ilu_fill [0]=        & The fill level $k$ \\
SSOR     & \verb=-p {ssor|3}=    & \verb=-ssor_omega [1.0]=    & The relaxation coefficient \\
         &                       &                             & $\omega$ ($0<\omega<2$) \\
Hybrid   & \verb=-p {hybrid|4}=  & \verb=-hybrid_i [sor]=      & The linear solver\\
         &                       & \verb=-hybrid_maxiter [25]= & The maximum number of iterations \\
         &                       & \verb=-hybrid_tol [1.0e-3]= & The convergence tolerance \\
         &                       & \verb=-hybrid_omega [1.5]=  & The relaxation coefficient $\omega$ \\
         &                       &                             & of the SOR ($0<\omega<2$) \\
         &                       & \verb=-hybrid_ell [2]=      & The degree $l$ of the BiCGSTAB(l) \\
         &                       & \verb=-hybrid_restart [40]= & The restart values of the GMRES \\
         &                       &                             & and Orthomin \\
I+S      & \verb=-p {is|5}=      & \verb=-is_alpha [1.0]=      & The parameter $\alpha$ of $I+\alpha S^{(m)}$ \\
         &                       & \verb=-is_m [3]=            & The parameter $m$ of $I+\alpha S^{(m)}$ \\
SAINV    & \verb=-p {sainv|6}=   & \verb=-sainv_drop [0.05]=   & The drop criterion\\
SA-AMG   & \verb=-p {saamg|7}=   & \verb=-saamg_unsym [false]= & Select the unsymmetric version    \\
         &                       &                             & (The matrix structure must be \\
         &                       &                             & symmetric)    \\
         &                       & \verb=-saamg_theta [0.05|0.12]= & The drop criterion $a^2_{ij}\le\theta^2|a_{ii}||a_{jj}|$ \\
         &                       &                             & (symmetric or unsymmetric) \\
Crout ILU& \verb=-p {iluc|8}=    & \verb=-iluc_drop [0.05]=    & The drop criterion    \\
         &                       & \verb=-iluc_rate [5.0]=     & The ratio of the maximum fill-in \\
ILUT     & \verb=-p {ilut|9}=    &     \\
Additive & \verb=-adds true=     & \verb=-adds_iter [1]=       & The number of iterations   \\
Schwarz  &                       &                             &                            \\
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Other Options}\\
\begin{tabular}{l|ll}\hline\hline
Option &                          \\ \hline
\verb=-emaxiter [1000]= & The maximum number of iterations         \\ 
\verb=-etol [1.0e-12]=  & The convergence tolerance                \\
\verb=-eprint [0]=      & The output of the residual history                \\
                       & \verb=-eprint {none|0}     =  None \\
                       & \verb=-eprint {mem|1}      =  Save the residual history\\
                       & \verb=-eprint {out|2}      =  Output it to the standard output\\
                       & \verb=-print {all|3}       =  Save the residual history and output it \\
                       & \verb=                     =  to the standard output \\
\verb=-ie [ii]= & The inner eigensolver used in Subspace, Lanczos, and Arnoldi\\
\verb=-ige [gii]= & The inner eigensolver used in Generalized Subspace, Generalized Lanczos, \\
                       & and Generalized Arnoldi\\
\verb=-shift [0.0]= & The amount of the real part of the shift $\sigma$ to compute $A-\sigma B$ \\
\verb=-shift_im [0.0]= & The amount of the imaginary part of the shift $\sigma$ \\
\verb=-initx_ones [1]= & The behavior of the initial vector $x_{0}$  \\
                       & \verb=-initx_ones {false|0}     =  The components are given by the argument \verb=x= \\
                       & \verb=                          =  of the function \verb=lis_esolve()= \\
                       & \verb=-initx_ones {true|1}      =  All the components are set to $1$ \\
\verb=-omp_num_threads [t]= & The number of threads        \\ 
                            & (\verb=t= represents the maximum number of
 threads) \\
\verb=-estorage [0]=   & The matrix storage format \\
\verb=-estorage_block [2]=& The block size of the BSR and BSC formats\\ 
\verb=-ef [0]=         & The precision of the eigensolver\\
                       & \verb=-ef {double|0}       =  Double precision \\ 
                       & \verb=-ef {quad|1}         =  Double-double (quadruple) precision \\
\verb=-rval [0]=       & The Ritz values \\
                       & \verb=-rval {false|0}     =  The eigenpairs are computed based on the Ritz values \\
                       & \verb=-rval {true|1}      =  Only the Ritz values are computed \\
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\ \\
\noindent
{\bf Solving Eigenvalue Problems}

To solve the standard eigenvalue problem $Ax = \lambda x$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_esolve(LIS_MATRIX A, LIS_VECTOR x,|\\ 
      \verb|         LIS_REAL evalue, LIS_ESOLVER esolver)|
\item \verb|Fortran subroutine lis_esolve(LIS_MATRIX A, LIS_VECTOR x,|\\
      \verb|         LIS_REAL evalue, LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{itemize}
To solve the generalized eigenvalue problem $Ax = \lambda Bx$, the following functions are used instead:
\begin{itemize}
\item \verb|C       LIS_INT lis_gesolve(LIS_MATRIX A, LIS_MATRIX B,|\\ 
      \verb|         LIS_VECTOR x, LIS_REAL evalue, LIS_ESOLVER esolver)|
\item \verb|Fortran subroutine lis_gesolve(LIS_MATRIX A, LIS_MATRIX B,|\\
      \verb|         LIS_VECTOR x, LIS_REAL evalue, LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{itemize}

\subsection{Writing Programs}
\label{sec:testprog3}
The following are the programs for solving the linear equation $Ax = b$,
where matrix $A$ is a tridiagonal matrix 
\[
\left(
\begin{array}{ccccc}
2 & -1 &   &  &   \\
-1 & 2 & -1 &  &   \\
  & \ddots  & \ddots  & \ddots  &   \\
  &   & -1 & 2 & -1 \\
  &   &   & -1 & 2 \\
\end{array}
\right)
\]
of size $12$.
The the right-hand side vector $b$ is set such that the values of the elements of the solution $x$ are $1$. 
The programs are located in the directory \verb|lis-($VERSION)/test|. 

\begin{itemsquarebox}[l]{Test program: test4.c}
{\small
\begin{verbatim}
 1: #include <stdio.h> 
 2: #include "lis.h" 
 3: main(LIS_INT argc, char *argv[]) 
 4: { 
 5:     LIS_INT i,n,gn,is,ie,iter; 
 6:     LIS_MATRIX A; 
 7:     LIS_VECTOR b,x,u; 
 8:     LIS_SOLVER solver; 
 9:     n = 12; 
10:     lis_initialize(&argc,&argv); 
11:     lis_matrix_create(LIS_COMM_WORLD,&A); 
12:     lis_matrix_set_size(A,0,n); 
13:     lis_matrix_get_size(A,&n,&gn) 
14:     lis_matrix_get_range(A,&is,&ie) 
15:     for(i=is;i<ie;i++) 
16:     { 
17:         if( i>0 ) lis_matrix_set_value(LIS_INS_VALUE,i,i-1,-1.0,A); 
18:         if( i<gn-1 ) lis_matrix_set_value(LIS_INS_VALUE,i,i+1,-1.0,A); 
19:         lis_matrix_set_value(LIS_INS_VALUE,i,i,2.0,A); 
20:     } 
21:     lis_matrix_set_type(A,LIS_MATRIX_CSR); 
22:     lis_matrix_assemble(A); 
23:  
24:     lis_vector_duplicate(A,&u); 
25:     lis_vector_duplicate(A,&b); 
26:     lis_vector_duplicate(A,&x); 
27:     lis_vector_set_all(1.0,u); 
28:     lis_matvec(A,u,b); 
29:  
30:     lis_solver_create(&solver); 
31:     lis_solver_set_optionC(solver); 
32:     lis_solve(A,b,x,solver); 
33:     lis_solver_get_iter(solver,&iter); 
34:     printf("number of iterations = %d\n",iter); 
35:     lis_vector_print(x); 
36:     lis_matrix_destroy(A); 
37:     lis_vector_destroy(u); 
38:     lis_vector_destroy(b); 
39:     lis_vector_destroy(x); 
40:     lis_solver_destroy(solver); 
41:     lis_finalize(); 
42:     return 0; 
43: } 
}
\end{verbatim}
}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Test program: test4f.F}
{\small
\begin{verbatim}
 1:      implicit none
 2:      
 3:#include "lisf.h"
 4:
 5:      LIS_INTEGER i,n,gn,is,ie,iter,ierr
 6:      LIS_MATRIX A
 7:      LIS_VECTOR b,x,u
 8:      LIS_SOLVER solver
 9:      n  = 12
10:      call lis_initialize(ierr)
11:      call lis_matrix_create(LIS_COMM_WORLD,A,ierr)
12:      call lis_matrix_set_size(A,0,n,ierr)
13:      call lis_matrix_get_size(A,n,gn,ierr)
14:      call lis_matrix_get_range(A,is,ie,ierr)
15:      do i=is,ie-1
16:        if( i>1  ) call lis_matrix_set_value(LIS_INS_VALUE,i,i-1,-1.0d0,
17:     .                                        A,ierr)
18:        if( i<gn ) call lis_matrix_set_value(LIS_INS_VALUE,i,i+1,-1.0d0,
19:     .                                        A,ierr)
20:        call lis_matrix_set_value(LIS_INS_VALUE,i,i,2.0d0,A,ierr)
21:      enddo
22:      call lis_matrix_set_type(A,LIS_MATRIX_CSR,ierr)
23:      call lis_matrix_assemble(A,ierr)
24:
25:      call lis_vector_duplicate(A,u,ierr)
26:      call lis_vector_duplicate(A,b,ierr)
27:      call lis_vector_duplicate(A,x,ierr)
28:      call lis_vector_set_all(1.0d0,u,ierr)
29:      call lis_matvec(A,u,b,ierr)
30:
31:      call lis_solver_create(solver,ierr)
32:      call lis_solver_set_optionC(solver,ierr)
33:      call lis_solve(A,b,x,solver,ierr)
34:      call lis_solver_get_iter(solver,iter,ierr)
35:      write(*,*) 'number of iterations = ',iter
36:      call lis_vector_print(x,ierr)
37:      call lis_matrix_destroy(A,ierr)
38:      call lis_vector_destroy(b,ierr)
39:      call lis_vector_destroy(x,ierr)
40:      call lis_vector_destroy(u,ierr)
41:      call lis_solver_destroy(solver,ierr)
42:      call lis_finalize(ierr)
43:
44:      stop
45:      end
\end{verbatim}
}
\end{itemsquarebox}

\newpage
\subsection{An Alternate Workflow: PSD}
\label{subsec:psd}
The previous section represents one of two workflows in Lis.  The present
workflow represents a decoupling of the preconditioner and the solver
(Preconditioner and Solver Decoupled, or PSD), in the sense that the
preconditioner can be updated \textit{separately} from the solver; in the
workflow presented in the previous section, the preconditioner is updated with
\textit{every} call to lis\_solve.  This property (conditional updating of the
preconditioner) turns out to be quite useful in solving certain problems,
including some nonlinear partial differential equations.  For nonlinear PDEs,
iterative solution methods are used (\textit{e.g.}, Newton-Raphson) to
calculate a solution.  In the current context, each Newton-Raphson iteration
calculates an incremental improvement to a solution vector via the solution of
a linear system of equations.  To support this functionality, the following
(additional) functions must be used:
%
\begin{itemize}
\item lis\_matrix\_psd\_set\_value: Re-define the value of an existing matrix component.
\item lis\_matrix\_psd\_reset\_scale: Set the matrix ``scaled'' status to
\textit{false}.  Note that this call and the following one are only needed for
the case non-trivial scaling.
\item lis\_vector\_psd\_reset\_scale: Set the vector ``scaled'' status to \textit{false}.
\item lis\_solver\_set\_matrix: Associate the given matrix and solver.  Note that this must be done
before the call to lis\_precon\_psd\_create.
\item lis\_precon\_psd\_create: Create data structures associated with the chosen preconditioner.
\item lis\_precon\_psd\_update: Evaluate the preconditioner.
\end{itemize}
%
It is noted that this workflow currently has the following restrictions:
%
\begin{itemize}
\item The only matrix format currently supported is CSR.
\item The only solver currently supported is GMRES.
\item The only preconditioners currently supported are ILU(k) and SA-AMG.
\end{itemize}
%
Error checking has been implemented to prevent any unsupported cases from
running.

\vspace{1pc}

The following pseudo-code listing presents an example of the workflow.
An actual implementation can be seen in test problem test8f.F90.

\vspace{1pc}

\begin{itemsquarebox}[l]{Pseudo-code example of workflow}
{\small
\begin{verbatim}
  1:      PROGRAM psd_driver
  2:
  3:      implicit none
  4:      
  5:#include "lisf.h"
  6:
  7:      LIS_INTEGER i,n,gn,is,ie,iter,ierr
  8:      LIS_MATRIX A
  9:      LIS_VECTOR b,x
 10:      LIS_SOLVER solver
 11:      REAL :: u(:),du
 12:
 13:      CALL lis_initialize(ierr)
 14:
 15:     !==================================================================
 16:     ! initialization, only done once
 17:     !==================================================================
 18:      CALL lis_matrix_create(LIS_COMM_WORLD,A,ierr)
 19:      CALL lis_matrix_set_size(A,0,n,ierr)
 20:      CALL lis_matrix_get_size(A,n,gn,ierr)
 21:      CALL lis_matrix_get_range(A,is,ie,ierr)
 22:
 23:      CALL UpdateLinearSystem(RHS,LHS)
 24:      DO i=is,ie-1
 25:         DO j=1,gn
 26:             IF (LHS(i,j) exists) THEN
 27:                   CALL lis_matrix_set_value(LIS_INS_VALUE,i,j,LHS(i,j),A,ierr)
 28:             END IF
 29:         END DO
 30:      END DO
 31:      CALL lis_matrix_set_type(A,LIS_MATRIX_CSR,ierr)
 32:      CALL lis_matrix_assemble(A,ierr)
 33:
 34:      CALL lis_vector_duplicate(A,b,ierr)
 35:      CALL lis_vector_duplicate(A,x,ierr)
 36:      DO i=is,ie-1
 37:           CALL lis_vector_set_value(LIS_INS_VALUE,i,RHS(i),b,ierr)
 38:      END DO
 39:      u = u_initial
 40:
 41:      CALL lis_solver_create(solver,ierr)
 42:      WRITE(UNIT=options,FMT='(a)') "-p ilu -i gmres -print out -scale none"
 43:      CALL lis_solver_set_option(TRIM(options),solver,ierr)
 44:
 45:     !==================================================================
 46:     ! everything up to this point is more or less identical to the standard workflow.
 47:     ! Now comes the preconditioner initialization, and the Newton-Raphson
 48:     ! iteration.
 49:     !==================================================================
 50:     CALL lis_solver_set_matrix(A,solver,ierr)
 51:     CALL lis_precon_psd_create(solver,precon,ierr)
 52:     ! evaluate the preconditioner, at least once . . .
 53:     CALL lis_precon_psd_update(solver,precon,ierr)
 54:
\end{verbatim}
}
\end{itemsquarebox}
\begin{itemsquarebox}[l]{Pseudo-code example of workflow (contd.)}
{\small
\begin{verbatim}
 55:     DO
 56:
 57:         IF (UpdateLHS) THEN
 58:             DO i=is,ie-1
 59:                 DO j=1,gn
 60:                     IF (component (i,j) exists) THEN
 61:                         CALL lis_matrix_psd_set_value(LIS_INS_VALUE,i,j,LHS(i,j),A,ierr)
 62:                     END IF
 63:                 END DO
 64:              END DO
 65:              CALL lis_matrix_psd_reset_scale(A,ierr)
 66:         END IF
 67:
 68:         ! update RHS every iteration
 69:         DO i=is,ie-1
 70:             CALL lis_vector_set_value(LIS_INS_VALUE,i,RHS(i),b,ierr)
 71:         END DO
 72:         CALL lis_vector_psd_reset_scale(A,ierr)
 73:
 74:         IF (UpdateLHS) THEN
 75:             CALL lis_precon_psd_update(solver,precon,ierr)
 76:         END IF
 77:         CALL lis_solve_kernel(A,b,x,solver,precon,ierr)
 78:         CALL lis_solver_get_iter(solver,iter,ierr)
 79:         write(*,*) 'number of iterations = ',iter
 80:         CALL lis_vector_print(x,ierr)
 81:
 82:         ! update the solution
 83:         DO i=is,ie-1
 84:             CALL lis_vector_get_value(x,i,du,ierr)
 85:             u(i)=u(i)-du
 86:         END DO
 87:
 88:         CALL UpdateLinearSystem(RHS,LHS)
 89:
 90:         IF (termination criteria satisfied) EXIT
 91:
 92:     END DO
 93:
 94:
 95:      CALL lis_matrix_destroy(A,ierr)
 96:      CALL lis_vector_destroy(b,ierr)
 97:      CALL lis_vector_destroy(x,ierr)
 98:      CALL lis_vector_destroy(u,ierr)
 99:      CALL lis_solver_destroy(solver,ierr)
100:
101:      CALL lis_finalize(ierr)
102:
103:      END PROGRAM psd_driver
\end{verbatim}
}
\end{itemsquarebox}

\newpage
\subsection{Compiling and Linking}
Provided below is an example {\tt test4.c} located in
the directory \verb|lis-($VERSION)/test|, 
compiled on the SGI Altix 3700 using the Intel C/C++ Compiler (icc). 
Since the library includes some Fortran 90 codes 
when the SA-AMG preconditioner is selected, 
a Fortran 90 compiler must be used for the linking. 
The preprocessor macro \verb|USE_MPI| must be defined for the
multiprocessing environment. 
The preprocessor macros {\tt \_LONG\_\_LONG} for C and {\tt LONG\_\_LONG} 
for Fortran must be defined when using the 64bit integer.

\begin{itemsquarebox}[l]{For the serial environment}
\small
{\bf Compiling}\\
\verb+      > icc -c -I($INSTALLDIR)/include test4.c+\\
{\bf Linking}\\
\verb+      > icc -o test4 test4.o -L($INSTALLDIR)/lib -llis+\\
{\bf Linking (with SA-AMG)}\\
\verb+      > ifort -nofor_main -o test4 test4.o -L($INSTALLDIR)/lib -llis+
\end{itemsquarebox}
\begin{itemsquarebox}[l]{For multithreaded environment}
\small
{\bf Compiling}\\
\verb+      > icc -c -openmp -I($INSTALLDIR)/include test4.c+\\
{\bf Linking}\\
\verb+      > icc -openmp -o test4 test4.o -L($INSTALLDIR)/lib -llis+\\
{\bf Linking (with SA-AMG)}\\
\verb+      > ifort -nofor_main -openmp -o test4 test4.o -L($INSTALLDIR)/lib -llis+
\end{itemsquarebox}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
{\bf Compiling}\\
\verb+      > icc -c -DUSE_MPI -I($INSTALLDIR)/include test4.c+\\
{\bf Linking}\\
\verb+      > icc -o test4 test4.o -L($INSTALLDIR)/lib -llis -lmpi+\\
{\bf Linking (with SA-AMG)}\\
\verb+      > ifort -nofor_main -o test4 test4.o -L($INSTALLDIR)/lib -llis -lmpi+
\end{itemsquarebox}
\begin{itemsquarebox}[l]{For multithreaded and multiprocessing environments}
\small
{\bf Compiling}\\
\verb+      > icc -c -openmp -DUSE_MPI -I($INSTALLDIR)/include test4.c+\\
{\bf Linking}\\
\verb+      > icc -openmp -o test4 test4.o -L($INSTALLDIR)/lib -llis -lmpi+\\
{\bf Linking (with SA-AMG)}\\
\verb+      > ifort -nofor_main -openmp -o test4 test4.o -L($INSTALLDIR)/lib -llis -lmpi+
\end{itemsquarebox}

Provided below is an example \verb|test4f.F| located 
in the directory \verb|lis-($VERSION)/test|, compiled on the SGI Altix 3700 
using the Intel Fortran Compiler (ifort). 
Since compiler directives are used in the program, 
an appropriate compiler option should be specified to use the preprocessor.
\verb|-fpp| is the option for for the Intel compiler. 

\begin{itemsquarebox}[l]{For serial environment}
\small
{\bf Compiling}\\
\verb+      > ifort -c -fpp -I($INSTALLDIR)/include test4f.F+\\
{\bf Linking}\\
\verb+      > ifort -o test4f test4f.o -L($INSTALLDIR)/lib -llis+\\
\end{itemsquarebox}
\begin{itemsquarebox}[l]{For multithreaded environment}
\small
{\bf Compiling}\\
\verb+      > ifort -c -fpp -openmp -I($INSTALLDIR)/include test4f.F+\\
{\bf Linking}\\
\verb+      > ifort -openmp -o test4f test4f.o -L($INSTALLDIR)/lib -llis+\\
\end{itemsquarebox}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
{\bf Compiling}\\
\verb+      > ifort -c -fpp -DUSE_MPI -I($INSTALLDIR)/include test4f.F+\\
{\bf Linking}\\
\verb+      > ifort -o test4f test4f.o -L($INSTALLDIR)/lib -llis -lmpi+\\
\end{itemsquarebox}
\begin{itemsquarebox}[l]{For multithreaded and multiprocessing environments}
\small
{\bf Compiling}\\
\verb+      > ifort -c -fpp -openmp -DUSE_MPI -I($INSTALLDIR)/include test4f.F+\\
{\bf Linking}\\
\verb+      > ifort -openmp -o test4f test4f.o -L($INSTALLDIR)/lib -llis -lmpi+\\
\end{itemsquarebox}

\subsection{Running}
The test programs \verb|test4| and \verb|test4f| 
in the directory \verb|lis-($VERSION)/test| are run as follows: \\\\
{\bf For serial environment}\\
\verb+      > ./test4 -i bicgstab+\\
{\bf For multithreaded environment}\\
\verb+      > env OMP_NUM_THREADS=2 ./test4 -i bicgstab +\\
{\bf For multiprocessing environment}\\
\verb+      > mpirun -np 2 ./test4 -i bicgstab +\\
{\bf For multithreaded and multiprocessing environment}\\
\verb+      > mpirun -np 2 env OMP_NUM_THREADS=2 ./test4 -i bicgstab +\\\\
The solution will be returned:

\begin{verbatim}
initial vector x      : all components set to 0
precision             : double
linear solver         : BiCGSTAB
preconditioner        : none
convergence condition : ||b-Ax||_2 <= 1.0e-12 * ||b-Ax_0||_2
matrix storage format : CSR
linear solver status  : normal end

    0 1.000000e+000
    1 1.000000e+000
    2 1.000000e+000
    3 1.000000e+000
    4 1.000000e+000
    5 1.000000e+000
    6 1.000000e+000
    7 1.000000e+000
    8 1.000000e+000
    9 1.000000e+000
   10 1.000000e+000
   11 1.000000e+000
\end{verbatim}

\subsection{Zero DOFs on a Process}
For the case of multiple MPI processes, it is possible to specify
$global\_n = 0$ and $local\_n \ge 0$. This will allow one or more
MPI processes to have zero DOFs. However, it is still the case that,
for $global\_n = 0$, the summation of $local\_n$ over all processes
should be greater than zero. 

\newpage
\section{Quadruple Precision Operations}
\label{sec:quadruple}
\indent
Double precision operations sometimes require a large number of iterations 
because of the rounding error. Besides long double precision operations,
Lis supports "double-double" precision operations, 
or quadruple precision operations by combining 
two double precision floating point numbers\cite{dd,qd}.
To use the double-double precision with the same interface 
as the double precision operations, 
both the matrix and vectors are assumed to be double precision. 
Lis also supports the performance acceleration of the double-double precision
operations with the SIMD instructions, such as
Intel's Streaming SIMD Extensions (SSE)\cite{quadlis}. 

\subsection{Using Quadruple Precision Operations}
\label{sec:testprog5}
The test program \verb|test5.c| solves a linear equation $Ax =b$, where $A$ is a Toeplitz matrix
\[
\left(
\begin{array}{cccccc}
2 & 1 &   &  &  & \\
0 & 2 & 1 &  &  & \\
\gamma & 0& 2 & 1 &  & \\
 & \ddots & \ddots & \ddots & \ddots & \\
 &  &   \gamma &0 &       2   & 1 \\
 &  &  &   \gamma & 0& 2 \\
\end{array}
\right).
\]
The right-hand vector is set such that the values of the elements 
of the solution $x$ are $1$. The value $n$ is the size of matrix $A$.
\verb|test5| with option {\tt -f} is run: \\
\\ \\
\noindent
{\bf Double precision}\\
By entering
\verb+      > ./test5 200 2.0 -f double+\\
the following results will be returned:

\begin{verbatim}
n = 200, gamma = 2.000000

initial vector x      : all components set to 0
precision             : double
linear solver         : BiCG
preconditioner        : none
convergence condition : ||b-Ax||_2 <= 1.0e-12 * ||b-Ax_0||_2
matrix storage format : CSR
linear solver status  : normal end

BiCG: number of iterations = 1001 (double = 1001, quad = 0)
BiCG: elapsed time         = 2.044368e-02 sec.
BiCG:   preconditioner     = 4.768372e-06 sec. 
BiCG:     matrix creation  = 4.768372e-06 sec.
BiCG:   linear solver      = 2.043891e-02 sec.
BiCG: relative residual    = 8.917591e+01
\end{verbatim}

\noindent
{\bf Quadruple precision}\\
By entering
\verb+      > ./test5 200 2.0 -f quad+\\
the following results will be returned:

\begin{verbatim}
n = 200, gamma = 2.000000

initial vector x      : all components set to 0
precision             : quad
linear solver         : BiCG
preconditioner        : none
convergence condition : ||b-Ax||_2 <= 1.0e-12 * ||b-Ax_0||_2
matrix storage format : CSR
linear solver status  : normal end

BiCG: number of iterations = 230 (double = 230, quad = 0)
BiCG: elapsed time         = 2.267408e-02 sec.
BiCG:   preconditioner     = 4.549026e-04 sec. 
BiCG:     matrix creation  = 5.006790e-06 sec.
BiCG:   linear solver      = 2.221918e-02 sec.
BiCG: relative residual    = 6.499145e-11
\end{verbatim}

\newpage
\section{Matrix Storage Formats}
\label{sec:storages}
This section describes the matrix storage formats supported by the library. 
Assume that the matrix row (column) number begins with $0$ and 
that the number of nonzero elements of matrix $A$ of size $n \times
n$ is $nnz$.

\subsection{Compressed Sparse Row (CSR)}
The CSR format uses three arrays {\ttfamily ptr}, {\ttfamily index} and {\ttfamily value} to store data.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length 
      $nnz$, which stores the nonzero elements of matrix $A$ along the row.
\item {\ttfamily index} is an integer array of length $nnz$,
      which stores the column numbers of the nonzero elements stored in
      the  array {\ttfamily value}.
\item {\ttfamily ptr} is an integer array of length $n+1$, which
      stores the starting points of the rows of the arrays {\ttfamily value} and {\ttfamily index}. 
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage01} shows how matrix $A$ in Figure \ref{fig:storage01} is stored in the CSR format. A program to create the matrix in the CSR format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ \label{eq:mata}
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage01.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of CSR format (for serial and multithreaded environments).}\label{fig:storage01}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,nnz;
 2: LIS_INT *ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 8;
 6: ptr   = (LIS_INT *)malloc( (n+1)*sizeof(LIS_INT) );
 7: index = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
 8: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
 9: lis_matrix_create(0,&A);
10: lis_matrix_set_size(A,0,n);
11:
12: ptr[0] = 0; ptr[1] = 1; ptr[2] = 3; ptr[3] = 5; ptr[4] = 8;
13: index[0] =  0; index[1] =  0; index[2] =  1; index[3] =  1;
14: index[4] =  2; index[5] =  0; index[6] =  2; index[7] =  3;
15: value[0] = 11; value[1] = 21; value[2] = 22; value[3] = 32;
16: value[4] = 33; value[5] = 41; value[6] = 43; value[7] = 44;
17:
18: lis_matrix_set_csr(nnz,ptr,index,value,A);
19: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage01_mpi} shows how matrix $A$ in 
Figure \ref{fig:storage01} is stored in the CSR format on two 
processing elements. A program to create the matrix in the CSR format 
on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage01_mpi.eps} 
\caption{Data structure of CSR format (for multiprocessing environment).}\label{fig:storage01_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT i,k,n,nnz,my_rank;
 2: LIS_INT *ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; nnz = 3;}
 7: else             {n = 2; nnz = 5;}
 8: ptr   = (LIS_INT *)malloc( (n+1)*sizeof(LIS_INT) );
 9: index = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
10: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
11: lis_matrix_create(MPI_COMM_WORLD,&A);
12: lis_matrix_set_size(A,n,0);
13: if( my_rank==0 ) {
14:     ptr[0] = 0; ptr[1] = 1; ptr[2] = 3;
15:     index[0] =  0; index[1] =  0; index[2] =  1;
16:     value[0] = 11; value[1] = 21; value[2] = 22;}
17: else {
18:     ptr[0] = 0; ptr[1] = 2; ptr[2] = 5;
19:     index[0] =  1; index[1] =  2; index[2] =  0; index[3] =  2; index[4] =  3;
20:     value[0] = 32; value[1] = 33; value[2] = 41; value[3] = 43; value[4] = 44;}
21: lis_matrix_set_csr(nnz,ptr,index,value,A);
22: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the CSR format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_csr(LIS_INT nnz, LIS_INT ptr[], LIS_INT index[],|\\
      \verb| LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_csr(LIS_INTEGER nnz, LIS_INTEGER ptr(),|\\
      \verb| LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Compressed Sparse Column (CSC)}
The CSS format uses three arrays {\ttfamily ptr}, {\ttfamily index} and
{\ttfamily value} to store data.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length
      $nnz$, which stores the nonzero elements of matrix $A$ along the column.
\item {\ttfamily index} is an integer array of length $nnz$, which
      stores the row numbers of the nonzero elements stored in the
      array {\ttfamily value}.
\item {\ttfamily ptr} is an integer array of length $n+1$, which
      stores the starting points of the rows of the arrays {\ttfamily value} and {\ttfamily index}. 
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage02} shows how matrix $A$ in Figure \ref{fig:storage02} is stored in the CSC format. A program to create the matrix in the CSC format is as follows:

\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage02.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of CSC format (for serial and multithreaded environments).}\label{fig:storage02}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,nnz;
 2: LIS_INT *ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 8;
 6: ptr   = (LIS_INT *)malloc( (n+1)*sizeof(LIS_INT) );
 7: index = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
 8: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
 9: lis_matrix_create(0,&A);
10: lis_matrix_set_size(A,0,n);
11:
12: ptr[0] = 0; ptr[1] = 3; ptr[2] = 5; ptr[3] = 7; ptr[4] = 8;
13: index[0] =  0; index[1] =  1; index[2] =  3; index[3] =  1;
14: index[4] =  2; index[5] =  2; index[6] =  3; index[7] =  3;
15: value[0] = 11; value[1] = 21; value[2] = 41; value[3] = 22;
16: value[4] = 32; value[5] = 33; value[6] = 43; value[7] = 44;
17:
18: lis_matrix_set_csc(nnz,ptr,index,value,A);
19: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage02_mpi} shows how matrix $A$ in Figure
\ref{fig:storage02} is stored on two processing elements. A program to create the
matrix in the CSC format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage02_mpi.eps} 
\caption{Data structure of CSC format (for multiprocessing environment).}\label{fig:storage02_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT i,k,n,nnz,my_rank;
 2: LIS_INT *ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; nnz = 3;}
 7: else             {n = 2; nnz = 5;}
 8: ptr   = (LIS_INT *)malloc( (n+1)*sizeof(LIS_INT) );
 9: index = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
10: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
11: lis_matrix_create(MPI_COMM_WORLD,&A);
12: lis_matrix_set_size(A,n,0);
13: if( my_rank==0 ) {
14:     ptr[0] = 0; ptr[1] = 3; ptr[2] = 5;
15:     index[0] =  0; index[1] =  1; index[2] =  3; index[3] =  1; index[4] =  2;
16:     value[0] = 11; value[1] = 21; value[2] = 41; value[3] = 22; value[4] = 32}
17: else {
18:     ptr[0] = 0; ptr[1] = 2; ptr[2] = 3;
19:     index[0] =  2; index[1] =  3; index[2] =  3;
20:     value[0] = 33; value[1] = 43; value[2] = 44;}
21: lis_matrix_set_csc(nnz,ptr,index,value,A);
22: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the CSC format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_csc(LIS_INT nnz, LIS_INT row[], LIS_INT index[],|\\
      \verb| LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_csc(LIS_INTEGER nnz, LIS_INTEGER row(),|\\
      \verb| LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Modified Compressed Sparse Row (MSR)}
The MSR format uses two arrays {\ttfamily index} and {\ttfamily value} to store data. 
Assume that $ndz$ represents the number of zero elements of the diagonal.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length
      $nnz+ndz+1$, which stores the diagonal of matrix A down to the
      $n$-th element. The $n+1$-th element is not used. For the $n+2$-th
      and after, the values of the nonzero elements except the diagonal of matrix $A$ are stored along the row.
\item {\ttfamily index} is an integer array of length
      $nnz+ndz+1$, 
      which stores the starting points of the rows of the off-diagonal
      elements of matrix $A$ down to the $n+1$-th element. For the
      $n+2$-th and after, 
      it stores the row numbers of the off-diagonal elements of
      matrix $A$ stored in the array {\ttfamily value}.
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage03} shows how matrix A is stored in the MSR format. A program to create the matrix in the MSR format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage03.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of MSR format (for serial and multithreaded environments).}\label{fig:storage03}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,nnz,ndz;
 2: LIS_INT *index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 8; ndz = 0;
 6: index = (LIS_INT *)malloc( (nnz+ndz+1)*sizeof(LIS_INT) );
 7: value = (LIS_SCALAR *)malloc( (nnz+ndz+1)*sizeof(LIS_SCALAR) );
 8: lis_matrix_create(0,&A);
 9: lis_matrix_set_size(A,0,n);
10:
11: index[0] =  5; index[1] =  5; index[2] =  6; index[3] =  7;
12: index[4] =  9; index[5] =  0; index[6] =  1; index[7] =  0; index[8] =  2;
13: value[0] = 11; value[1] = 22; value[2] = 33; value[3] = 44;
14: value[4] =  0; value[5] = 21; value[6] = 32; value[7] = 41; value[8] = 43;
15:
16: lis_matrix_set_msr(nnz,ndz,index,value,A);
17: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage03_mpi} shows how matrix $A$ in Figure
\ref{fig:storage03} is stored in the MSR format on two processing 
elements. A program to create the matrix in the MSR format on two processing element is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage03_mpi.eps} 
\caption{Data structure of MSR format (for multiprocessing environment).}\label{fig:storage03_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT i,k,n,nnz,ndz,my_rank;
 2: LIS_INT *index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; nnz = 3; ndz = 0;}
 7: else             {n = 2; nnz = 5; ndz = 0;}
 8: index = (LIS_INT *)malloc( (nnz+ndz+1)*sizeof(LIS_INT) );
 9: value = (LIS_SCALAR *)malloc( (nnz+ndz+1)*sizeof(LIS_SCALAR) );
10: lis_matrix_create(MPI_COMM_WORLD,&A);
11: lis_matrix_set_size(A,n,0);
12: if( my_rank==0 ) {
13:     index[0] =  3; index[1] =  3; index[2] =  4; index[3] =  0;
14:     value[0] = 11; value[1] = 22; value[2] =  0; value[3] = 21;}
15: else {
16:     index[0] =  3; index[1] =  4; index[2] =  6; index[3] =  1;
17:     index[4] =  0; index[5] =  2;
18:     value[0] = 33; value[1] = 44; value[2] =  0; value[3] = 32;
19:     value[4] = 41; value[5] = 43;}
20: lis_matrix_set_msr(nnz,ndz,index,value,A);
21: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the MSR format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_msr(LIS_INT nnz, LIS_INT ndz, LIS_INT index[],|\\
      \verb| LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_msr(LIS_INTEGER nnz, LIS_INTEGER ndz,|\\
      \verb| LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Diagonal (DIA)}
The DIA format uses two arrays {\ttfamily index} and {\ttfamily value} to store
data. Assume that $nnd$ represents the number of nonzero diagonal
elements of matrix $A$.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length
      $nnd \times n$, which stores the values of the nonzero diagonal elements of matrix $A$.
\item {\ttfamily index} is an integer array of length $nnd$,
      which stores the offsets from the main diagonal.
\end{itemize}

For the multithreaded environment, the following modifications have been made:
the format uses two arrays {\ttfamily index} and {\ttfamily value} to store
data. Assume that $nprocs$ represents the number of threads.
$nnd_p$ is the number of nonzero diagonal elements of the partial matrix into which the row block of matrix $A$ is divided.
$maxnnd$ is the maximum value $nnd_p$.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length 
      $maxnnd \times n$, which stores the values of the nonzero diagonal elements of matrix $A$.
\item {\ttfamily index} is an integer array of length $nprocs
      \times maxnnd$, which stores the offsets from the main diagonal.
\end{itemize}

\subsubsection{Creating Matrices (for Serial Environment)}
The diagram on the right in Figure \ref{fig:storage04} shows how matrix $A$
in Figure \ref{fig:storage04} is stored in the DIA format. A program to create the matrix in the DIA format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage04.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of DIA format (for serial environment).}\label{fig:storage04}}
\end{figure}
\begin{itemsquarebox}[l]{For serial environment}
\small
\begin{verbatim}
 1: LIS_INT n,nnd;
 2: LIS_INT *index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnd = 3;
 6: index = (LIS_INT *)malloc( nnd*sizeof(LIS_INT) );
 7: value = (LIS_SCALAR *)malloc( n*nnd*sizeof(LIS_SCALAR) );
 8: lis_matrix_create(0,&A);
 9: lis_matrix_set_size(A,0,n);
10:
11: index[0] = -3; index[1] = -1; index[2] =  0;
12: value[0] =  0; value[1] =  0; value[2] =  0; value[3] = 41;
13: value[4] =  0; value[5] = 21; value[6] = 32; value[7] = 43;
14: value[8] = 11; value[9] = 22; value[10]= 33; value[11]= 44;
15:
16: lis_matrix_set_dia(nnd,index,value,A);
17: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multithreaded Environment)}
Figure \ref{fig:storage04_omp} shows how matrix $A$ in Figure \ref{fig:storage04} is stored in the DIA format on two threads. A program to create the matrix in the DIA format on two threads is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage04_omp.eps} 
\caption{Data structure of DIA format (for multithreaded environment).}\label{fig:storage04_omp}}
\end{figure}
\begin{itemsquarebox}[l]{For multithreaded environment}
\small
\begin{verbatim}
 1: LIS_INT n,maxnnd,nprocs;
 2: LIS_INT *index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; maxnnd = 3; nprocs = 2;
 6: index = (LIS_INT *)malloc( maxnnd*sizeof(LIS_INT) );
 7: value = (LIS_SCALAR *)malloc( n*maxnnd*sizeof(LIS_SCALAR) );
 8: lis_matrix_create(0,&A);
 9: lis_matrix_set_size(A,0,n);
10:
11: index[0] = -1; index[1] =  0; index[2] =  0; index[3] = -3; index[4] = -1; index[5] =  0;
12: value[0] =  0; value[1] = 21; value[2] = 11; value[3] = 22; value[4] =  0; value[5] =  0;
13: value[6] =  0; value[7] = 41; value[8] = 32; value[9] = 43; value[10]= 33; value[11]= 44;
14:
15: lis_matrix_set_dia(maxnnd,index,value,A);
16: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage04_mpi} shows how matrix $A$ in Figure \ref{fig:storage04} is stored in the DIA format on two processing elements. A program to create the matrix in the DIA format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage04_mpi.eps} 
\caption{Data structure of DIA format (for multiprocessing environment).}\label{fig:storage04_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT i,n,nnd,my_rank;
 2: LIS_INT *index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; nnd = 2;}
 7: else             {n = 2; nnd = 3;}
 8: index = (LIS_INT *)malloc( nnd*sizeof(LIS_INT) );
 9: value = (LIS_SCALAR *)malloc( n*nnd*sizeof(LIS_SCALAR) );
10: lis_matrix_create(MPI_COMM_WORLD,&A);
11: lis_matrix_set_size(A,n,0);
12: if( my_rank==0 ) {
13:     index[0] = -1; index[1] =  0;
14:     value[0] =  0; value[1] = 21; value[2] = 11; value[3] = 22;}
15: else {
16:     index[0] = -3; index[1] = -1; index[2] =  0;
17:     value[0] =  0; value[1] = 41; value[2] = 32; value[3] = 43; value[4] = 33;
18:     value[5] = 44;}
19: lis_matrix_set_dia(nnd,index,value,A);
20: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the DIA format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_dia(LIS_INT nnd, LIS_INT index[],|\\
      \verb| LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_dia(LIS_INTEGER nnd, LIS_INTEGER index(),|\\
      \verb| LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Ellpack-Itpack Generalized Diagonal (ELL)}
The ELL format uses two arrays {\ttfamily index} and {\ttfamily value} to store
data. Assume that $maxnzr$ is the maximum value of the number of nonzero elements in the rows of matrix $A$.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length 
      $maxnzr \times n$, which stores the values of the nonzero elements of the rows
      of matrix $A$ along the column. The first column consists of
      the first nonzero elements of each row. If there is no nonzero elements to be stored, then $0$ is stored.
\item {\ttfamily index} is an integer array of length $maxnzr
      \times n$, which stores the column numbers of the nonzero
      elements stored in the array {\ttfamily value}. If the number of
      nonzero elements in the $i$-th row is $nnz$, then {\tt index[$nnz
      \times n + i$]} stores row number $i$.
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage05} shows how matrix $A$ in Figure \ref{fig:storage05} is stored in the ELL format. A program to create the matrix in the ELL format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage05.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of ELL format (for serial and multithreaded environments).}\label{fig:storage05}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,maxnzr;
 2: LIS_INT *index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; maxnzr = 3;
 6: index = (LIS_INT *)malloc( n*maxnzr*sizeof(LIS_INT) );
 7: value = (LIS_SCALAR *)malloc( n*maxnzr*sizeof(LIS_SCALAR) );
 8: lis_matrix_create(0,&A);
 9: lis_matrix_set_size(A,0,n);
10:
11: index[0] =  0; index[1] =  0; index[2] =  1; index[3] =  0; index[4] =  0; index[5] =  1;
12: index[6] =  2; index[7] =  2; index[8] =  0; index[9] =  1; index[10]=  2; index[11]=  3;
13: value[0] = 11; value[1] = 21; value[2] = 32; value[3] = 41; value[4] =  0; value[5] = 22;
14: value[6] = 33; value[7] = 43; value[8] =  0; value[9] =  0; value[10]=  0; value[11]= 44;
15:
16: lis_matrix_set_ell(maxnzr,index,value,A);
17: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage05_mpi} shows how matrix $A$ in Figure \ref{fig:storage05} is stored in the ELL format. A program to create the matrix in the ELL format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage05_mpi.eps} 
\caption{Data structure of ELL format (for multiprocessing environment).}\label{fig:storage05_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT i,n,maxnzr,my_rank;
 2: LIS_INT *index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; maxnzr = 2;}
 7: else             {n = 2; maxnzr = 3;}
 8: index = (LIS_INT *)malloc( n*maxnzr*sizeof(LIS_INT) );
 9: value = (LIS_SCALAR *)malloc( n*maxnzr*sizeof(LIS_SCALAR) );
10: lis_matrix_create(MPI_COMM_WORLD,&A);
11: lis_matrix_set_size(A,n,0);
12: if( my_rank==0 ) {
13:     index[0] =  0; index[1] =  0; index[2] =  0; index[3] =  1;
14:     value[0] = 11; value[1] = 21; value[2] =  0; value[3] = 22;}
15: else {
16:     index[0] =  1; index[1] =  0; index[2] =  2; index[3] =  2; index[4] =  2;
17:     index[5] =  3;
18:     value[0] = 32; value[1] = 41; value[2] = 33; value[3] = 43; value[4] =  0;
19:     value[5] = 44;}
20: lis_matrix_set_ell(maxnzr,index,value,A);
21: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate an array required by the ELL format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_ell(LIS_INT maxnzr, LIS_INT index[],|\\
      \verb| LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_ell(LIS_INTEGER maxnzr, LIS_INTEGER index(),|\\
      \verb| LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Jagged Diagonal (JAD)}
The JAD format first sorts the nonzero elements of the rows in decreasing order of
size, and then stores them along the column. The JAD format uses four
arrays, {\ttfamily perm}, {\ttfamily ptr}, {\ttfamily index}, and {\ttfamily
value}, to store data. Assume that $maxnzr$ represents the maximum value
of the number of nonzero elements of matrix $A$.
\begin{itemize}
\item {\ttfamily perm} is an integer array of length $n$, which stores the sorted row numbers.
\item {\ttfamily value} is a double precision array of length 
      $nnz$, which stores the values of the jagged diagonal elements of the sorted matrix $A$. The
      first jagged diagonal consists of the values of the first nonzero elements of
      each row. The next jagged diagonal consists of the values of the second nonzero 
      elements, and so on. 
\item {\ttfamily index} is an integer array of length $nnz$,
      which stores the row numbers of the nonzero elements stored in
      the array {\ttfamily value}.
\item {\ttfamily ptr} is an integer array of length $maxnzr+1$,
      which stores the starting points of the jagged diagonal elements.
\end{itemize}

For the multithreaded environment, the following modifications have been made:
the format uses four arrays, {\ttfamily perm}, {\ttfamily ptr}, {\ttfamily
index}, and {\ttfamily value}, to store data. Assume that $nprocs$ is the
number of threads.
$maxnzr_p$ is the number of nonzero diagonal elements of the partial matrix into which the row block of matrix $A$ is divided.
$maxmaxnzr$ is the maximum value of $maxnzr_p$.
\begin{itemize}
\item {\ttfamily perm} is an integer array of length $n$, which stores the sorted row numbers.
\item {\ttfamily value} is a double precision array of length 
      $nnz$, which stores the values of the jagged diagonal elements of the sorted matrix $A$. The
      first jagged diagonal consists of the values of the first nonzero elements of
      each row. The next jagged diagonal consist of the values of the second
      nonzero elements of each row, and so on. 
\item {\ttfamily index} is an integer array of length $nnz$,
      which stores the row numbers of the nonzero elements stored in
      the array {\ttfamily value}.
\item {\ttfamily ptr} is an integer array of length $nprocs
      \times (maxmaxnzr + 1)$, which stores the starting points of the
      jagged diagonal elements.
\end{itemize}

\newpage
\subsubsection{Creating Matrices (for Serial Environment)}
The diagram on the right in Figure \ref{fig:storage06} shows how matrix $A$ in Figure \ref{fig:storage06} is stored in the JAD format. A program to create the matrix in the JAD format is as follows: 
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage06.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of JAD format (for serial environment).}\label{fig:storage06}}
\end{figure}
\begin{itemsquarebox}[l]{For serial environment}
\small
\begin{verbatim}
 1: LIS_INT n,nnz,maxnzr;
 2: LIS_INT *perm,*ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 8; maxnzr = 3;
 6: perm  = (LIS_INT *)malloc( n*sizeof(LIS_INT) );
 7: ptr   = (LIS_INT *)malloc( (maxnzr+1)*sizeof(LIS_INT) );
 8: index = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
 9: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
10: lis_matrix_create(0,&A);
11: lis_matrix_set_size(A,0,n);
12:
13: perm[0] = 3; perm[1] = 1; perm[2] = 2; perm[3] = 0;
14: ptr[0]  = 0; ptr[1]  = 4; ptr[2]  = 7; ptr[3]  = 8;
15: index[0] =  0; index[1] =  0; index[2] =  1; index[3] =  0;
16: index[4] =  2; index[5] =  1; index[6] =  2; index[7] =  3;
17: value[0] = 41; value[1] = 21; value[2] = 32; value[3] = 11;
18: value[4] = 43; value[5] = 22; value[6] = 33; value[7] = 44;
19:
20: lis_matrix_set_jad(nnz,maxnzr,perm,ptr,index,value,A);
21: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multithreaded Environment)}
Figure \ref{fig:storage06_omp} shows how matrix $A$ in Figure \ref{fig:storage06} is stored in the JAD format on two threads. A program to create the matrix in the JAD format on two threads is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage06_omp.eps} 
\caption{Data structure of JAD format (for multithreaded environment).}\label{fig:storage06_omp}}
\end{figure}
\begin{itemsquarebox}[l]{For multithreaded environment}
\small
\begin{verbatim}
 1: LIS_INT n,nnz,maxmaxnzr,nprocs;
 2: LIS_INT *perm,*ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 8; maxmaxnzr = 3; nprocs = 2;
 6: perm  = (LIS_INT *)malloc( n*sizeof(LIS_INT) );
 7: ptr   = (LIS_INT *)malloc( nprocs*(maxmaxnzr+1)*sizeof(LIS_INT) );
 8: index = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
 9: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
10: lis_matrix_create(0,&A);
11: lis_matrix_set_size(A,0,n);
12:
13: perm[0] = 1; perm[1] = 0; perm[2] = 3; perm[3] = 2;
14: ptr[0]  = 0; ptr[1]  = 2; ptr[2]  = 3; ptr[3]  = 0;
15: ptr[4]  = 3; ptr[5]  = 5; ptr[6]  = 7; ptr[7]  = 8;
16: index[0] =  0; index[1] =  0; index[2] =  1; index[3] =  0;
17: index[4] =  1; index[5] =  2; index[6] =  2; index[7] =  3;
18: value[0] = 21; value[1] = 11; value[2] = 22; value[3] = 41;
19: value[4] = 32; value[5] = 43; value[6] = 33; value[7] = 44;
20:
21: lis_matrix_set_jad(nnz,maxmaxnzr,perm,ptr,index,value,A);
22: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage06_mpi} shows how matrix $A$ in Figure \ref{fig:storage06} is stored in the JAD format on two processing elements. A program to create the matrix in the JAD format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage06_mpi.eps} 
\caption{Data structure of JAD format (for multiprocessing environment).}\label{fig:storage06_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT i,n,nnz,maxnzr,my_rank;
 2: LIS_INT *perm,*ptr,*index;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; nnz = 3; maxnzr = 2;}
 7: else             {n = 2; nnz = 5; maxnzr = 3;}
 8: perm  = (LIS_INT *)malloc( n*sizeof(LIS_INT) );
 9: ptr   = (LIS_INT *)malloc( (maxnzr+1)*sizeof(LIS_INT) );
10: index = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
11: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
12: lis_matrix_create(MPI_COMM_WORLD,&A);
13: lis_matrix_set_size(A,n,0);
14: if( my_rank==0 ) {
15:     perm[0] = 1; perm[1] = 0;
16:     ptr[0]  = 0; ptr[1]  = 2; ptr[2]  = 3;
17:     index[0] =  0; index[1] =  0; index[2] =  1;
18:     value[0] = 21; value[1] = 11; value[2] = 22;}
19: else {
20:     perm[0] = 3; perm[1] = 2;
21:     ptr[0]  = 0; ptr[1]  = 2; ptr[2]  = 4; ptr[3]  = 5;
22:     index[0] =  0; index[1] =  1; index[2] =  2; index[3] =  2; index[4] =  3;
23:     value[0] = 41; value[1] = 32; value[2] = 43; value[3] = 33; value[4] = 44;}
24: lis_matrix_set_jad(nnz,maxnzr,perm,ptr,index,value,A);
25: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate an array required by the JAD format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_jad(LIS_INT nnz, LIS_INT maxnzr, LIS_INT perm[],|\\
      \verb| LIS_INT ptr[], LIS_INT index[], LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_jad(LIS_INTEGER nnz, LIS_INTEGER maxnzr,|\\
      \verb| LIS_INTEGER perm(), LIS_INTEGER ptr(), LIS_INTEGER index(), LIS_SCALAR value(),|\\
      \verb| LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Block Sparse Row (BSR)}
The BSR format breaks down matrix $A$ into partial matrices called blocks of size $r \times c$. 
The BSR format stores the nonzero blocks, in which at least one nonzero
element exists, in a format similar to that of CSR. 
Assume that $nr=n/r$ and $bnnz$ are the numbers of nonzero blocks of $A$. 
The BSR format uses three arrays {\ttfamily bptr}, {\ttfamily bindex} and {\ttfamily value} to store data.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length
      $bnnz \times r \times c$, which stores the values of the elements of the nonzero blocks.
\item {\ttfamily bindex} is an integer array of length $bnnz$,
      which stores the block column numbers of the nonzero blocks.
\item {\ttfamily bptr} is an integer array of length $nr+1$,
      which stores the starting points of the block rows in the array {\ttfamily bindex}.
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage07} shows how matrix $A$ in Figure \ref{fig:storage07} is stored in the BSR format. A program to create the matrix in the BSR format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cc|cc}
11 &    &    &    \\
21 & 22 &    &    \\ \hline
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage07.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of BSR format (for serial and multithreaded environments).}\label{fig:storage07}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,bnr,bnc,nr,nc,bnnz;
 2: LIS_INT *bptr,*bindex;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; bnr = 2; bnc = 2; bnnz = 3; nr = (n-1)/bnr+1; nc = (n-1)/bnc+1;
 6: bptr   = (LIS_INT *)malloc( (nr+1)*sizeof(LIS_INT) );
 7: bindex = (LIS_INT *)malloc( bnnz*sizeof(LIS_INT) );
 8: value  = (LIS_SCALAR *)malloc( bnr*bnc*bnnz*sizeof(LIS_SCALAR) );
 9: lis_matrix_create(0,&A);
10: lis_matrix_set_size(A,0,n);
11:
12: bptr[0] = 0; bptr[1] = 1; bptr[2] = 3;
13: bindex[0] =  0; bindex[1] =  0; bindex[2] =  1;
14: value[0]  = 11; value[1] = 21; value[2] =  0; value[3] = 22;
15: value[4]  =  0; value[5] = 41; value[6] = 32; value[7] =  0;
16: value[8]  = 33; value[9] = 43; value[10]=  0; value[11]= 44;
17:
18: lis_matrix_set_bsr(bnr,bnc,bnnz,bptr,bindex,value,A);
19: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage07_mpi} shows how matrix $A$ in Figure \ref{fig:storage07} is stored in the BSR format on two processing elements. A program to create the matrix in the BSR format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage07_mpi.eps} 
\caption{Data structure of BSR format (for multiprocessing environment).}\label{fig:storage07_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT n,bnr,bnc,nr,nc,bnnz,my_rank;
 2: LIS_INT *bptr,*bindex;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; bnr = 2; bnc = 2; bnnz = 1; nr = (n-1)/bnr+1; nc = (n-1)/bnc+1;}
 7: else             {n = 2; bnr = 2; bnc = 2; bnnz = 2; nr = (n-1)/bnr+1; nc = (n-1)/bnc+1;}
 8: bptr   = (LIS_INT *)malloc( (nr+1)*sizeof(LIS_INT) );
 9: bindex = (LIS_INT *)malloc( bnnz*sizeof(LIS_INT) );
10: value  = (LIS_SCALAR *)malloc( bnr*bnc*bnnz*sizeof(LIS_SCALAR) );
11: lis_matrix_create(MPI_COMM_WORLD,&A);
12: lis_matrix_set_size(A,n,0);
13: if( my_rank==0 ) {
14:     bptr[0] = 0; bptr[1] = 1;
15:     bindex[0] =  0;
16:     value[0]  = 11; value[1] = 21; value[2] =  0; value[3] = 22;}
17: else {
18:     bptr[0] = 0; bptr[1] = 2;
19:     bindex[0] =  0; bindex[1] =  1;
20:     value[0]  =  0; value[1]  = 41; value[2] = 32; value[3] =  0;
21:     value[4]  = 33; value[5]  = 43; value[6] =  0; value[7] = 44;}
22: lis_matrix_set_bsr(bnr,bnc,bnnz,bptr,bindex,value,A);
23: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the BSR format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_bsr(LIS_INT bnr, LIS_INT bnc, LIS_INT bnnz,|\\
      \verb| LIS_INT bptr[], LIS_INT bindex[], LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_bsr(LIS_INTEGER bnr, LIS_INTEGER bnc,|\\
      \verb| LIS_INTEGER bnnz, LIS_INTEGER bptr(), LIS_INTEGER bindex(), LIS_SCALAR value(),|\\
      \verb| LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Block Sparse Column (BSC)}
The BSC format breaks down matrix $A$ into partial matrices called
blocks of size $r \times c$. The BSC format stores the nonzero blocks, in which at
least one nonzero element exists, in a format similar to that of CSC. Assume
that $nc=n/c$ and $bnnz$ are the numbers of the nonzero
blocks of A. The BSC format uses three arrays {\ttfamily bptr}, {\ttfamily bindex}
and {\ttfamily value} to store data. 
\begin{itemize}
\item {\ttfamily value} is a double precision array of length
      $bnnz \times r \times c$, which stores the values of the elements of the nonzero blocks.
\item {\ttfamily bindex} is an integer array of length $bnnz$,
      which stores the block row numbers of the nonzero blocks.
\item {\ttfamily bptr} is an integer array of length $nc+1$,
      which stores the starting points of the block columns in the array
      {\ttfamily bindex}.
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage08} shows how matrix $A$ in Figure \ref{fig:storage08} is stored in the BSC format. A program to create the matrix in the BSC format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cc|cc}
11 &    &    &    \\
21 & 22 &    &    \\ \hline
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage08.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of BSC format (for serial and multithreaded environments).}\label{fig:storage08}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,bnr,bnc,nr,nc,bnnz;
 2: LIS_INT *bptr,*bindex;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; bnr = 2; bnc = 2; bnnz = 3; nr = (n-1)/bnr+1; nc = (n-1)/bnc+1;
 6: bptr   = (LIS_INT *)malloc( (nc+1)*sizeof(LIS_INT) );
 7: bindex = (LIS_INT *)malloc( bnnz*sizeof(LIS_INT) );
 8: value  = (LIS_SCALAR *)malloc( bnr*bnc*bnnz*sizeof(LIS_SCALAR) );
 9: lis_matrix_create(0,&A);
10: lis_matrix_set_size(A,0,n);
11:
12: bptr[0] = 0; bptr[1] = 1; bptr[2] = 3;
13: bindex[0] =  0; bindex[1] =  1; bindex[2] =  1;
14: value[0]  = 11; value[1] = 21; value[2] =  0; value[3] = 22;
15: value[4]  =  0; value[5] = 41; value[6] = 32; value[7] =  0;
16: value[8]  = 33; value[9] = 43; value[10]=  0; value[11]= 44;
17:
18: lis_matrix_set_bsc(bnr,bnc,bnnz,bptr,bindex,value,A);
19: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage08_mpi} shows how matrix $A$ in Figure
\ref{fig:storage08} is stored in the BSC format on two processing
elements. A program to create the matrix in the BSC format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage08_mpi.eps} 
\caption{Data structure of BSC format (for multiprocessing environment).}\label{fig:storage08_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT n,bnr,bnc,nr,nc,bnnz,my_rank;
 2: LIS_INT *bptr,*bindex;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; bnr = 2; bnc = 2; bnnz = 2; nr = (n-1)/bnr+1; nc = (n-1)/bnc+1;}
 7: else             {n = 2; bnr = 2; bnc = 2; bnnz = 1; nr = (n-1)/bnr+1; nc = (n-1)/bnc+1;}
 8: bptr   = (LIS_INT *)malloc( (nr+1)*sizeof(LIS_INT) );
 9: bindex = (LIS_INT *)malloc( bnnz*sizeof(LIS_INT) );
10: value  = (LIS_SCALAR *)malloc( bnr*bnc*bnnz*sizeof(LIS_SCALAR) );
11: lis_matrix_create(MPI_COMM_WORLD,&A);
12: lis_matrix_set_size(A,n,0);
13: if( my_rank==0 ) {
14:     bptr[0] = 0; bptr[1] = 2;
15:     bindex[0] =  0; bindex[1] =  1;
16:     value[0]  = 11; value[1]  = 21; value[2] =  0; value[3] = 22;
17:     value[4]  =  0; value[5]  = 41; value[6] = 32; value[7] =  0;}
18: else {
19:     bptr[0] = 0; bptr[1] = 1;
20:     bindex[0] =  1;
21:     value[0]  = 33; value[1]  = 43; value[2] =  0; value[3] = 44;}
22: lis_matrix_set_bsc(bnr,bnc,bnnz,bptr,bindex,value,A);
23: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the BSC format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_bsc(LIS_INT bnr, LIS_INT bnc, LIS_INT bnnz,|\\
      \verb| LIS_INT bptr[], LIS_INT bindex[], LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_bsc(LIS_INTEGER bnr, LIS_INTEGER bnc,|\\
      \verb| LIS_INTEGER bnnz, LIS_INTEGER bptr(), LIS_INTEGER bindex(), LIS_SCALAR value(),|\\
      \verb| LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Variable Block Row (VBR)}
The VBR format is the generalized version of the BSR format. The division points of the rows and columns are given by the arrays {\ttfamily row} and {\ttfamily col}. 
The VBR format stores the nonzero blocks (the blocks in which at least
one nonzero element exists) in a format similar to that of CSR. 
Assume that $nr$ and $nc$ are the numbers of row and column divisions, respectively, 
and that $bnnz$ denotes the number of nonzero blocks of A, 
and $nnz$ denotes the total number of elements of the nonzero blocks. 
The VBR format uses six arrays, {\ttfamily bptr}, {\ttfamily bindex}, {\ttfamily
row}, {\ttfamily col}, {\ttfamily ptr}, and {\ttfamily value}, to store data.
\begin{itemize}
\item {\ttfamily row} is an integer array of length $nr+1$, which
      stores the starting row number of the block rows.
\item {\ttfamily col} is an integer array of length $nc+1$, which
      stores the starting column number of the block columns.
\item {\ttfamily bindex} is an integer array of length $bnnz$,
      which stores the block column numbers of the nonzero blocks.
\item {\ttfamily bptr} is an integer array of length $nr+1$,
      which stores the starting points of the block rows in the array {\ttfamily bindex}.
\item {\ttfamily value} is a double precision array of length
      $nnz$, which stores the values of the elements of the nonzero blocks.
\item {\ttfamily ptr} is an integer array of length $bnnz+1$,
      which stores the starting points of the nonzero blocks in the
      array {\ttfamily value}.
\end{itemize}

\newpage
\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage09} shows how matrix $A$ in Figure \ref{fig:storage09} is stored in the VBR format. A program to create the matrix in the VBR format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{c|cc|c}
11 &    &    &    \\ \hline
21 & 22 &    &    \\
   & 32 & 33 &    \\ \hline
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage09.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of VBR format (for serial and multithreaded environments).}\label{fig:storage09}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,nnz,nr,nc,bnnz;
 2: LIS_INT *row,*col,*ptr,*bptr,*bindex;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 11; bnnz = 6; nr = 3; nc = 3;
 6: bptr   = (LIS_INT *)malloc( (nr+1)*sizeof(LIS_INT) );
 7: row    = (LIS_INT *)malloc( (nr+1)*sizeof(LIS_INT) );
 8: col    = (LIS_INT *)malloc( (nc+1)*sizeof(LIS_INT) );
 9: ptr    = (LIS_INT *)malloc( (bnnz+1)*sizeof(LIS_INT) );
10: bindex = (LIS_INT *)malloc( bnnz*sizeof(LIS_INT) );
11: value  = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
12: lis_matrix_create(0,&A);
13: lis_matrix_set_size(A,0,n);
14:
15: bptr[0] = 0; bptr[1] = 1; bptr[2] = 3; bptr[3] = 6;
16: row[0]  = 0; row[1]  = 1; row[2]  = 3; row[3] = 4;
17: col[0]  = 0; col[1]  = 1; col[2]  = 3; col[3] = 4;
18: bindex[0] =  0; bindex[1] =  0; bindex[2] =  1; bindex[3] =  0;
19: bindex[4] =  1; bindex[5] =  2;
20: ptr[0]    =  0; ptr[1]    =  1; ptr[2]    =  3; ptr[3]    =  7;
21: ptr[4]    =  8; ptr[5]    = 10; ptr[6]    = 11;
22: value[0]  = 11; value[1]  = 21; value[2]  =  0; value[3]  = 22;
23: value[4]  = 32; value[5]  =  0; value[6]  = 33; value[7]  = 41;
24: value[8]  =  0; value[9]  = 43; value[10] = 44;
25:
26: lis_matrix_set_vbr(nnz,nr,nc,bnnz,row,col,ptr,bptr,bindex,value,A);
27: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage09_mpi} shows how matrix $A$ in Figure \ref{fig:storage09} is stored in the VBR format on two processing elements. A program to create the matrix in the VBR format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage09_mpi.eps} 
\caption{Data structure of VBR format (for multiprocessing environment).}\label{fig:storage09_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT n,nnz,nr,nc,bnnz,my_rank;
 2: LIS_INT *row,*col,*ptr,*bptr,*bindex;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; nnz = 7; bnnz = 3; nr = 2; nc = 3;}
 7: else             {n = 2; nnz = 4; bnnz = 3; nr = 1; nc = 3;}
 8: bptr   = (LIS_INT *)malloc( (nr+1)*sizeof(LIS_INT) );
 9: row    = (LIS_INT *)malloc( (nr+1)*sizeof(LIS_INT) );
10: col    = (LIS_INT *)malloc( (nc+1)*sizeof(LIS_INT) );
11: ptr    = (LIS_INT *)malloc( (bnnz+1)*sizeof(LIS_INT) );
12: bindex = (LIS_INT *)malloc( bnnz*sizeof(LIS_INT) );
13: value  = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
14: lis_matrix_create(MPI_COMM_WORLD,&A);
15: lis_matrix_set_size(A,n,0);
16: if( my_rank==0 ) {
17:     bptr[0] = 0; bptr[1] = 1; bptr[2] = 3;
18:     row[0]  = 0; row[1]  = 1; row[2]  = 3;
19:     col[0]  = 0; col[1]  = 1; col[2]  = 3; col[3] = 4;
20:     bindex[0] =  0; bindex[1] =  0; bindex[2] =  1;
21:     ptr[0]    =  0; ptr[1]    =  1; ptr[2]    =  3; ptr[3]    =  7;
22:     value[0]  = 11; value[1] = 21; value[2] =  0; value[3] = 22;
23:     value[4]  = 32; value[5] =  0; value[6] = 33;}
24: else {
25:     bptr[0] = 0; bptr[1] = 3;
26:     row[0]  = 3; row[1]  = 4;
27:     col[0]  = 0; col[1]  = 1; col[2]  = 3; col[3] = 4;
28:     bindex[0] =  0; bindex[1] =  1; bindex[2] =  2;
29:     ptr[0]    =  0; ptr[1]    =  1; ptr[2]    =  3; ptr[3]    =  4;
30:     value[0]  = 41; value[1]  =  0; value[2]  = 43; value[3]  = 44;}
31: lis_matrix_set_vbr(nnz,nr,nc,bnnz,row,col,ptr,bptr,bindex,value,A);
32: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the VBR format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_vbr(LIS_INT nnz, LIS_INT nr, LIS_INT nc,|\\
      \verb| LIS_INT bnnz, LIS_INT row[], LIS_INT col[], LIS_INT ptr[], LIS_INT bptr[],|\\
      \verb| LIS_INT bindex[], LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_vbr(LIS_INTEGER nnz, LIS_INTEGER nr,|\\
      \verb| LIS_INTEGER nc, LIS_INTEGER bnnz, LIS_INTEGER row(), LIS_INTEGER col(),|\\
      \verb| LIS_INTEGER ptr(), LIS_INTEGER bptr(), LIS_INTEGER bindex(), |\\
      \verb| LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Coordinate (COO)}
The COO format uses three arrays {\ttfamily row}, {\ttfamily col} and {\ttfamily value} to store data.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length
      $nnz$, which stores the values of the nonzero elements.
\item {\ttfamily row} is an integer array of length $nnz$, which stores the row numbers of the nonzero elements.
\item {\ttfamily col} is an integer array of length $nnz$, which stores the column numbers of the nonzero elements.
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The diagram on the right in Figure \ref{fig:storage10} shows how matrix $A$ in Figure \ref{fig:storage10} is stored in the COO format. A program to create the matrix in the COO format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage10.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of COO format (for serial and multithreaded environments).}\label{fig:storage10}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n,nnz;
 2: LIS_INT *row,*col;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: n = 4; nnz = 8;
 6: row   = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
 7: col   = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
 8: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
 9: lis_matrix_create(0,&A);
10: lis_matrix_set_size(A,0,n);
11:
12: row[0] = 0; row[1] = 1; row[2] = 3; row[3] = 1;
13: row[4] = 2; row[5] = 2; row[6] = 3; row[7] = 3;
14: col[0] = 0; col[1] = 0; col[2] = 0; col[3] = 1;
15: col[4] = 1; col[5] = 2; col[6] = 2; col[7] = 3;
16: value[0] = 11; value[1] = 21; value[2] = 41; value[3] = 22;
17: value[4] = 32; value[5] = 33; value[6] = 43; value[7] = 44;
18:
19: lis_matrix_set_coo(nnz,row,col,value,A);
20: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage10_mpi} shows how matrix $A$ in Figure
\ref{fig:storage10} is stored in the COO format on two processing
elements. A program to create the matrix in the COO format on two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage10_mpi.eps} 
\caption{Data structure of COO format (for multiprocessing environment).}\label{fig:storage10_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT n,nnz,my_rank;
 2: LIS_INT *row,*col;
 3: LIS_SCALAR *value;
 4: LIS_MATRIX A;
 5: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 6: if( my_rank==0 ) {n = 2; nnz = 3;}
 7: else             {n = 2; nnz = 5;}
 8: row   = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
 9: col   = (LIS_INT *)malloc( nnz*sizeof(LIS_INT) );
10: value = (LIS_SCALAR *)malloc( nnz*sizeof(LIS_SCALAR) );
11: lis_matrix_create(MPI_COMM_WORLD,&A);
12: lis_matrix_set_size(A,n,0);
13: if( my_rank==0 ) {
14:     row[0] = 0; row[1] = 1; row[2] = 1;
15:     col[0] = 0; col[1] = 0; col[2] = 1;
16:     value[0] = 11; value[1] = 21; value[2] = 22;}
17: else {
18:     row[0] = 3; row[1] = 2; row[2] = 2; row[3] = 3; row[4] = 3;
19:     col[0] = 0; col[1] = 1; col[2] = 2; col[3] = 2; col[4] = 3;
20:     value[0] = 41; value[1] = 32; value[2] = 33; value[3] = 43; value[4] = 44;}
21: lis_matrix_set_coo(nnz,row,col,value,A);
22: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the COO format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_coo(LIS_INT nnz, LIS_INT row[], LIS_INT col[],|\\
      \verb| LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_coo(LIS_INTEGER nnz, LIS_INTEGER row(),|\\
      \verb| LIS_INTEGER col(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{itemize}

\newpage
\subsection{Dense (DNS)}
The DNS format uses one array {\ttfamily value} to store data.
\begin{itemize}
\item {\ttfamily value} is a double precision array of length $n
      \times n$, which stores the values of the elements with priority given to the columns.
\end{itemize}

\subsubsection{Creating Matrices (for Serial and Multithreaded Environments)}
The right diagram in Figure \ref{fig:storage11} shows how matrix $A$ in Figure \ref{fig:storage11} is stored in the DNS format. A program to create the matrix in the DNS format is as follows:
\begin{figure}[h]
{\centering 
\begin{minipage}{0.3\textwidth}
\begin{flushright}
$ 
A = \left(
\begin{array}{cccc}
11 &    &    &    \\
21 & 22 &    &    \\
   & 32 & 33 &    \\
41 &    & 43 & 44 \\
\end{array}\right)
$
\end{flushright}
\end{minipage}
\begin{minipage}{0.6\textwidth}
\begin{flushleft}
\includegraphics{storage11.eps} 
\end{flushleft}
\end{minipage}
\caption{Data structure of DNS format (for serial and multithreaded environments).}\label{fig:storage11}}
\end{figure}
\begin{itemsquarebox}[l]{For serial and multithreaded environments}
\small
\begin{verbatim}
 1: LIS_INT n;
 2: LIS_SCALAR *value;
 3: LIS_MATRIX A;
 4: n = 4;
 5: value = (LIS_SCALAR *)malloc( n*n*sizeof(LIS_SCALAR) );
 6: lis_matrix_create(0,&A);
 7: lis_matrix_set_size(A,0,n);
 8:
 9: value[0] = 11; value[1] = 21; value[2] =  0; value[3] = 41;
10: value[4] =  0; value[5] = 22; value[6] = 32; value[7] =  0;
11: value[8] =  0; value[9] =  0; value[10]= 33; value[11]= 43;
12: value[12]=  0; value[13]=  0; value[14]=  0; value[15]= 44;
13:
14: lis_matrix_set_dns(value,A);
15: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\newpage
\subsubsection{Creating Matrices (for Multiprocessing Environment)}
Figure \ref{fig:storage11_mpi} shows how matrix $A$ in Figure
\ref{fig:storage11} is stored in the DNS format on two
processing elements. A program to create the matrix in the DNS format on
two processing elements is as follows:
\begin{figure}[h]
{\centering 
\includegraphics{storage11_mpi.eps} 
\caption{Data structure of DNS format (for multiprocessing environment).}\label{fig:storage11_mpi}}
\end{figure}
\begin{itemsquarebox}[l]{For multiprocessing environment}
\small
\begin{verbatim}
 1: LIS_INT n,my_rank;
 2: LIS_SCALAR *value;
 3: LIS_MATRIX A;
 4: MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);
 5: if( my_rank==0 ) {n = 2;}
 6: else             {n = 2;}
 7: value = (LIS_SCALAR *)malloc( n*n*sizeof(LIS_SCALAR) );
 8: lis_matrix_create(MPI_COMM_WORLD,&A);
 9: lis_matrix_set_size(A,n,0);
10: if( my_rank==0 ) {
11:     value[0] = 11; value[1] = 21; value[2] =  0; value[3] = 22;
12:     value[4] =  0; value[5] =  0; value[6] =  0; value[7] =  0;}
13: else {
14:     value[0] =  0; value[1] = 41; value[2] = 32; value[3] =  0;
15:     value[4] = 33; value[5] = 43; value[6] =  0; value[7] = 44;}
16: lis_matrix_set_dns(value,A);
17: lis_matrix_assemble(A);
\end{verbatim}
\end{itemsquarebox}

\subsubsection{Associating Arrays}
To associate the arrays in the DNS format with matrix $A$, the following functions are used:
\begin{itemize}
\item \verb|C       LIS_INT lis_matrix_set_dns(LIS_SCALAR value[], LIS_MATRIX A)|
\item \verb|Fortran subroutine lis_matrix_set_dns(LIS_SCALAR value(), LIS_MATRIX A,|\\
      \verb| LIS_INTEGER ierr)|
\end{itemize}

\newpage
\section{Functions}\label{sec:func}
This section describes the functions which can be employed by the user.
The statuses of the solvers are defined as follows: 
\\ \\ 
\noindent
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt LIS\_SUCCESS(0)] ~~~~~Normal termination
\item[\tt LIS\_ILL\_OPTION(1)] ~~~~~Illegal option
\item[\tt LIS\_BREAKDOWN(2)] ~~~~~Breakdown (division by zero)
\item[\tt LIS\_OUT\_OF\_MEMORY(3)] ~~~~~Out of working memory
\item[\tt LIS\_MAXITER(4)] ~~~~~Maximum number of iterations
\item[\tt LIS\_NOT\_IMPLEMENTED(5)] ~~~~~Not implemented
\item[\tt LIS\_ERR\_FILE\_IO(6)] ~~~~~File I/O error
\end{namelist}

\newpage
\subsection{Operating Vector Elements}
Assume that the size of vector $v$ is $global\_n$ and that the size
of the partial vectors stored on $nprocs$ processing elements 
is $local\_n$. $global\_n$ and $local\_n$ 
are called the global size and the local size, respectively.

\subsubsection{lis\_vector\_create}
\begin{screen}
\verb|C       LIS_INT lis_vector_create(LIS_Comm comm, LIS_VECTOR *v)|\\
\verb|Fortran subroutine lis_vector_create(LIS_Comm comm, LIS_VECTOR v, LIS_INTEGER ierr)| 
\end{screen}
\\ \\
\noindent
{\bf Description}\\
\indent
Create vector $v$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt comm] The MPI communicator
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the serial and multithreaded environments, the value of {\tt comm} is ignored.

\subsubsection{lis\_vector\_destroy}
\begin{screen}
\verb|C       LIS_INT lis_vector_destroy(LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_vector_destroy(LIS_VECTOR v, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Destroy vector $v$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector to be destroyed
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_duplicate}
\begin{screen}
\verb|C       LIS_INT lis_vector_duplicate(void *vin, LIS_VECTOR *vout)|
\verb|Fortran subroutine lis_vector_duplicate(LIS_VECTOR vin, LIS_VECTOR vout,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Create vector $v_{out}$, which has the same information as $v_{in}$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt vin] The source vector or matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt vout] The destination vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The function \verb|lis_vector_duplicate| does not copy the values, 
but allocates only the memory. To copy the values as well, 
the function \verb|lis_vector_copy| must be called after this function.

\subsubsection{lis\_vector\_set\_size}
\begin{screen}
\verb|C       LIS_INT lis_vector_set_size(LIS_VECTOR v, LIS_INT local_n,|\\
\verb|         LIS_INT global_n)|\\
\verb|Fortran subroutine lis_vector_set_size(LIS_VECTOR v, LIS_INTEGER local_n,|\\
\verb|         LIS_INTEGER global_n, LIS_INTEGER ierr)| 
\end{screen}
{\bf Description}\\
\indent
Assign the size of vector $v$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\item[\tt local\_n] The size of the partial vector
\item[\tt global\_n] The size of the global vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Either $local\_n$ or $global\_n$ must be provided.

For the serial and multithreaded environments, $local\_n$ 
is equal to $global\_n$. 
Therefore, both \\
\verb|lis_vector_set_size(v,n,0)| and \verb|lis_vector_set_size(v,0,n)| create a vector of size $n$. 

For the multiprocessing environment, \verb|lis_vector_set_size(v,n,0)| 
creates a partial vector of size $n$ on each processing element. On the other hand, 
\verb|lis_vector_set_size(v,0,n)| creates a partial vector of size 
$m_p$ on processing element $p$. The values of $m_p$ are determined by the library. 

\subsubsection{lis\_vector\_get\_size}
\begin{screen}
\verb|C       LIS_INT lis_vector_get_size(LIS_VECTOR v, LIS_INT *local_n,|\\
\verb|         LIS_INT *global_n)|\\
\verb|Fortran subroutine lis_vector_get_size(LIS_VECTOR v, LIS_INTEGER local_n,|\\
\verb|         LIS_INTEGER global_n, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the size of vector $v$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt local\_n] The size of the partial vector
\item[\tt global\_n] The size of the global vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the serial and multithreaded environments, $local\_n$ is equal to $global\_n$. 

\subsubsection{lis\_vector\_get\_range}
\begin{screen}
\verb|C       LIS_INT lis_vector_get_range(LIS_VECTOR v, LIS_INT *is, LIS_INT *ie)|
\verb|Fortran subroutine lis_vector_get_range(LIS_VECTOR v, LIS_INTEGER is,|\\
\verb|         LIS_INTEGER ie, LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Get the location of the partial vector $v$ in the global vector.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The partial vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt is] The location where the partial vector $v$ starts in the global vector
\item[\tt ie] The location where the partial vector $v$ ends in the global vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the serial and multithreaded environments, a vector of size $n$ results in $is = 0$ and $ie = n$ in the C version, and $is = 1$ and $ie = n+1$ in the Fortran version.

\newpage
\subsubsection{lis\_vector\_set\_value}
\begin{screen}
\verb|C       LIS_INT lis_vector_set_value(LIS_INT flag, LIS_INT i, LIS_SCALAR value,|
\verb|         LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_vector_set_value(LIS_INTEGER flag, LIS_INTEGER i,|\\
\verb|         LIS_SCALAR value, LIS_VECTOR v, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign the scalar value to the $i$-th row of vector $v$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt flag] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $v[i] = value$
\item[\tt LIS\_ADD\_VALUE]: $v[i] = v[i] + value$
\end{description}
\item[\tt i] The location where the value is assigned
\item[\tt value] The scalar value to be assigned
\item[\tt v] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector with the scalar value assigned to the $i$-th row
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the multiprocessing environment, the $i$-th row of the global vector must be specified instead 
of the $i$-th row of the partial vector.

\subsubsection{lis\_vector\_get\_value}
\begin{screen}
\verb|C       LIS_INT lis_vector_get_value(LIS_VECTOR v, LIS_INT i, LIS_SCALAR *value)|
\verb|Fortran subroutine lis_vector_get_value(LIS_VECTOR v, LIS_INTEGER i,|\\
\verb|         LIS_SCALAR value, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the scalar value of the $i$-th row of vector $v$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt i] The location where the value is assigned
\item[\tt v] The source vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The value of the $i$-th row
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the multiprocessing environment, the $i$-th row of the global vector must be
specified.

\newpage
\subsubsection{lis\_vector\_set\_values}
\begin{screen}
\verb|C       LIS_INT lis_vector_set_values(LIS_INT flag, LIS_INT count,|\\
\verb|         LIS_INT index[], LIS_SCALAR value[], LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_vector_set_values(LIS_INTEGER flag, LIS_INTEGER count,|\\
\verb|         LIS_INTEGER index(), LIS_SCALAR value(), LIS_VECTOR v, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign scalar $value[i]$ to the $index[i]$-th row of
vector $v$, where $i=0,1,...,count-1$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt flag] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $v[index[i]] = value[i]$
\item[\tt LIS\_ADD\_VALUE]: $v[index[i]] = v[index[i]] + value[i]$
\end{description}
\item[\tt count] The number of elements in the array that stores
		the scalar values to be assigned
\item[\tt index] The array that stores the location where the scalar values are assigned
\item[\tt value] The array that stores the scalar values to be assigned
\item[\tt v] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector with scalar $value[i]$ assigned to the $index[i]$-th row
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the multiprocessing environment, the $index[i]$-th row of the global vector must be specified instead 
of the $index[i]$-th row of the partial vector.

\newpage
\subsubsection{lis\_vector\_get\_values}
\begin{screen}
\verb|C       LIS_INT lis_vector_get_values(LIS_VECTOR v, LIS_INT start, LIS_INT count,|\\
\verb|         LIS_SCALAR value[])|\\
\verb|Fortran subroutine lis_vector_get_values(LIS_VECTOR v, LIS_INTEGER start,|\\
\verb|         LIS_INTEGER count, LIS_SCALAR value(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get scalar $value[i]$ of the $start+i$-th row of vector $v$, 
where $i=0,1,...,count-1$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt start] The starting location 
\item[\tt count] The number of values to get
\item[\tt v] The source vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The array to store the scalar values
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the multiprocessing environment, the $start+i$-th row of the global vector
must be specified.

\subsubsection{lis\_vector\_scatter}
\begin{screen}
\verb|C       LIS_INT lis_vector_scatter(LIS_SCALAR value[], LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_vector_scatter(LIS_SCALAR value(), LIS_VECTOR v,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign scalar $value[i]$ to the $i$-th row of vector $v$, 
where $i=0,1,..., global\_n-1$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The array that stores the scalar values to be assigned
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent

\newpage
\subsubsection{lis\_vector\_gather}
\begin{screen}
\verb|C       LIS_INT lis_vector_gather(LIS_VECTOR v, LIS_SCALAR value[])|\\
\verb|Fortran subroutine lis_vector_gather(LIS_VECTOR v, LIS_SCALAR value(),|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get scalar $value[i]$ of the $i$-th row of vector $v$, 
where $i=0,1,..., global\_n-1$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The source vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The array that stores the scalar values
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent

\subsubsection{lis\_vector\_is\_null}
\begin{screen}
\verb|C       LIS_INT lis_vector_is_null(LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_vector_is_null(LIS_VECTOR v,LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Determine if vector $v$ is available. 
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt LIS\_TRUE] Available
\item[\tt LIS\_FALSE] Not available  
\end{namelist}
\end{namelist}

\newpage
\subsection{Operating Matrix Elements}
Assume that the size of matrix $A$ is $global\_n$ $\times$ $global\_n$
and that the size of each partial matrix stored on $nprocs$ 
processing elements is $local\_n$ $\times$ $global\_n$. Here, $global\_n$
and $local\_n$ are called the number of rows of the global matrix
and the number of rows of the partial matrix, respectively. 
\subsubsection{lis\_matrix\_create}
\begin{screen}
\verb|C       LIS_INT lis_matrix_create(LIS_Comm comm, LIS_MATRIX *A)|
\verb|Fortran subroutine lis_matrix_create(LIS_Comm comm, LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Create matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt comm] The MPI communicator
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the serial and multithreaded environments, the value of {\tt comm} is ignored. 

\subsubsection{lis\_matrix\_destroy}
\begin{screen}
\verb|C       LIS_INT lis_matrix_destroy(LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_destroy(LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Destroy matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix to be destroyed
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The function \verb|lis_matrix_destroy| frees the memory 
for the set of arrays associated with matrix $A$.

\newpage
\subsubsection{lis\_matrix\_duplicate}
\begin{screen}
\verb|C       LIS_INT lis_matrix_duplicate(LIS_MATRIX Ain, LIS_MATRIX *Aout)|
\verb|Fortran subroutine lis_matrix_duplicate(LIS_MATRIX Ain, LIS_MATRIX Aout,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Create matrix $A_{out}$ which has the same information as $A_{in}$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt Ain] The source matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt Aout] The destination matrix
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The function \verb|lis_matrix_duplicate| does not copy the values of 
the elements of the matrix, but allocates only the memory. 
To copy the values of the elements as well, the function
\verb|lis_matrix_copy| must be called after this function.

\subsubsection{lis\_matrix\_malloc}
\begin{screen}
\verb|C       LIS_INT lis_matrix_malloc(LIS_MATRIX A, LIS_INT nnz_row, LIS_INT nnz[])|
\verb|Fortran subroutine lis_matrix_malloc(LIS_MATRIX A, LIS_INTEGER nnz_row,|\\
\verb|         LIS_INTEGER nnz[], LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Allocate memory for matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt nnz\_row] The average number of nonzero elements in each row
\item[\tt nnz] The array of numbers of nonzero elements in each row
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Either \verb|nnz_row| or \verb|nnz| must be provided.

This function allocates memory for the function \verb|lis_matrix_set_value|.

\newpage
\subsubsection{lis\_matrix\_set\_value}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_value(LIS_INT flag, LIS_INT i, LIS_INT j,|\\
\verb|         LIS_SCALAR value, LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_value(LIS_INTEGER flag, LIS_INTEGER i,|\\
\verb|         LIS_INTEGER j, LIS_SCALAR value, LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign the scalar value to the $(i, j)$-th element of matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt flag] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $A[i,j] = value$
\item[\tt LIS\_ADD\_VALUE]: $A[i,j] = A[i,j] + value$
\end{description}
\item[\tt i] The row number of the matrix
\item[\tt j] The column number of the matrix
\item[\tt value] The value to be assigned
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix 
\item[\tt ierr] The return code
\end{namelist}
\noindent
{\bf Note}\\
\indent
For the multiprocessing environment, the $i$-th row and the $j$-th column of the global matrix must 
be specified. 

The function \verb|lis_matrix_set_value| stores the assigned value in a temporary internal format. 
Therefore, after \verb|lis_matrix_set_value| is called, 
the function \verb|lis_matrix_assemble| must be called.

For large matrices, the introduction of the function \verb|lis_matrix_set_type|
should be considered. See {\tt lis-(\$VERSION)/test/test2.c} and
{\tt lis-(\$VERSION)/test/test2f.F90} for details.

\subsubsection{lis\_matrix\_assemble}
\begin{screen}
\verb|C       LIS_INT lis_matrix_assemble(LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_assemble(LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assemble matrix $A$ into the specified storage format.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix assembled into the specified storage format
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_matrix\_set\_size}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_size(LIS_MATRIX A, LIS_INT local_n,|\\
\verb|         LIS_INT global_n)|\\
\verb|Fortran subroutine lis_matrix_set_size(LIS_MATRIX A, LIS_INTEGER local_n,|\\
\verb|         LIS_INTEGER global_n, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign the size of matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt local\_n] The number of rows of the partial matrix
\item[\tt global\_n] The number of rows of the global matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Either $local\_n$ or $global\_n$ must be provided. 

For the serial and multithreaded environments, $local\_n$ is
equal to $global\_n$. 
Therefore, both \\
\verb|lis_matrix_set_size(A,n,0)| and \verb|lis_matrix_set_size(A,0,n)|
create a matrix of size $n \times n$.

For the multiprocessing environment, \verb|lis_matrix_set_size(A,n,0)| creates
a partial matrix of size $n \times N$ on each processing element, 
where $N$ is the total sum of $n$. 
On the other hand, \\
\verb|lis_matrix_set_size(A,0,n)| creates 
a partial matrix of size $m_p \times n$ on processing element $p$.
The values of $m_p$ are determined by the library.

\subsubsection{lis\_matrix\_get\_size}
\begin{screen}
\verb|C       LIS_INT lis_matrix_get_size(LIS_MATRIX A, LIS_INT *local_n,|
\verb|         LIS_INT *global_n)|\\
\verb|Fortran subroutine lis_matrix_get_size(LIS_MATRIX A, LIS_INTEGER local_n,|\\
\verb|         LIS_INTEGER global_n, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the size of matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt local\_n] The number of rows of the partial matrix
\item[\tt global\_n] The number of rows of the global matrix
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the serial and multithreaded environments, $local\_n$ is
equal to $global\_n$. 

\subsubsection{lis\_matrix\_get\_range}
\begin{screen}
\verb|C       LIS_INT lis_matrix_get_range(LIS_MATRIX A, LIS_INT *is, LIS_INT *ie)|
\verb|Fortran subroutine lis_matrix_get_range(LIS_MATRIX A, LIS_INTEGER is,|\\
\verb|         LIS_INTEGER ie, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the location of partial matrix $A$ in the global matrix.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The partial matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt is] The location where partial matrix $A$ starts in the global matrix
\item[\tt ie] The location where partial matrix $A$ ends in the global matrix
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the serial and multithreaded environments, a matrix of $n \times n$ results in $is = 0$ and $ie = n$ in the C version, and $is = 1$ and $ie = n+1$ in the Fortran version.


\subsubsection{lis\_matrix\_get\_nnz}
\begin{screen}
\verb|C       LIS_INT lis_matrix_get_nnz(LIS_MATRIX A, LIS_INT *nnz)|
\verb|Fortran subroutine lis_matrix_get_nnz(LIS_MATRIX A, LIS_INTEGER nnz,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the number of nonzero elements of matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnz] The number of nonzero elements
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
For the multiprocessing environment, this function gets  
the number of nonzero elements of partial matrix $A$. 

\newpage
\subsubsection{lis\_matrix\_set\_type}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_type(LIS_MATRIX A, LIS_INT matrix_type)|
\verb|Fortran subroutine lis_matrix_set_type(LIS_MATRIX A, LIS_INTEGER matrix_type,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign the storage format.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt matrix\_type] The storage format
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}
\noindent
{\bf Note}\\
\indent
\verb+matrix_type+ of $A$ is \verb+LIS_MATRIX_CSR+ when the matrix is created. 
The table below shows the available storage formats for \verb+matrix_type+.
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
\begin{tabular}{lll}\hline\hline
Storage format  & & \verb|matrix_type| \\ \hline
Compressed Sparse Row & (CSR) & \verb={LIS_MATRIX_CSR|1}= \\
Compressed Sparse Column & (CSC) & \verb={LIS_MATRIX_CSC|2}= \\
Modified Compressed Sparse Row & (MSR) & \verb={LIS_MATRIX_MSR|3}= \\
Diagonal &(DIA) & \verb={LIS_MATRIX_DIA|4}= \\
Ellpack-Itpack Generalized Diagonal &(ELL) & \verb={LIS_MATRIX_ELL|5}= \\
Jagged Diagonal &(JAD) & \verb={LIS_MATRIX_JAD|6}= \\
Block Sparse Row & (BSR) & \verb={LIS_MATRIX_BSR|7}= \\
Block Sparse Column &(BSC) & \verb={LIS_MATRIX_BSC|8}= \\
Variable Block Row &(VBR) & \verb={LIS_MATRIX_VBR|9}= \\
Coordinate & (COO) & \verb={LIS_MATRIX_COO|10}= \\
Dense &	(DNS) & \verb={LIS_MATRIX_DNS|11}= \\
\hline         
\end{tabular}
\end{center}
\end{minipage}

\subsubsection{lis\_matrix\_get\_type}
\begin{screen}
\verb|C       LIS_INT lis_matrix_get_type(LIS_MATRIX A, LIS_INT *matrix_type)|
\verb|Fortran subroutine lis_matrix_get_type(LIS_MATRIX A, LIS_INTEGER matrix_type,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the storage format.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt matrix\_type] The storage format
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_matrix\_set\_csr}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_csr(LIS_INT nnz, LIS_INT ptr[], LIS_INT index[],|\\
\verb|         LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_csr(LIS_INTEGER nnz, LIS_INTEGER ptr(),|\\
\verb|         LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the CSR format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnz] The number of nonzero elements
\item[\tt ptr, index, value] The arrays in the CSR format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_csr| is called, 
the function \verb|lis_matrix_assemble| must be called.
Array indexing must be zero-origin in the Fortran version.

\subsubsection{lis\_matrix\_set\_csc}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_csc(LIS_INT nnz, LIS_INT ptr[], LIS_INT index[],|\\
\verb|         LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_csc(LIS_INTEGER nnz, LIS_INTEGER ptr(),|\\
\verb|         LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the CSC format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnz] The number of nonzero elements
\item[\tt ptr, index, value] The arrays in the CSC format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays 
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_csc| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\newpage
\subsubsection{lis\_matrix\_set\_msr}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_msr(LIS_INT nnz, LIS_INT ndz, LIS_INT index[],|\\
\verb|         LIS_SCALAR value[], LIS_MATRIX A)| \\
\verb|Fortran subroutine lis_matrix_set_msr(LIS_INTEGER nnz, LIS_INTEGER ndz,|\\
\verb|         LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the MSR format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnz] The number of nonzero elements
\item[\tt ndz] The number of nonzero elements in the diagonal
\item[\tt index, value] The arrays in the MSR format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_msr| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\subsubsection{lis\_matrix\_set\_dia}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_dia(LIS_INT nnd, LIS_INT index[],|\\
\verb|         LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_dia(LIS_INTEGER nnd, LIS_INTEGER index(), |\\
\verb|         LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the DIA format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnd] The number of nonzero diagonal elements
\item[\tt index, value] The arrays in the DIA format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays 
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_dia| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\newpage
\subsubsection{lis\_matrix\_set\_ell}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_ell(LIS_INT maxnzr, LIS_INT index[],|\\
\verb|         LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_ell(LIS_INTEGER maxnzr,|\\
\verb|         LIS_INTEGER index(), LIS_SCALAR value(), LIS_MATRIX A,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the ELL format with matrix $A$. 
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt maxnzr] The maximum number of nonzero elements in each row
\item[\tt index, value] The arrays in the ELL format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_ell| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\subsubsection{lis\_matrix\_set\_jad}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_jad(LIS_INT nnz, LIS_INT maxnzr, LIS_INT perm[],|\\
\verb|         LIS_INT ptr[], LIS_INT index[], LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_jad(LIS_INTEGER nnz, LIS_INTEGER maxnzr,|\\
\verb|         LIS_INTEGER perm(), LIS_INTEGER ptr(), LIS_INTEGER index(),|\\
\verb|         LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the JAD format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnz] The number of nonzero elements
\item[\tt maxnzr] The maximum number of nonzero elements in each row
\item[\tt perm, ptr, index, value] The arrays in the JAD format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_jad| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\subsubsection{lis\_matrix\_set\_bsr}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_bsr(LIS_INT bnr, LIS_INT bnc, LIS_INT bnnz,|\\
\verb|         LIS_INT bptr[], LIS_INT bindex[], LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_bsr(LIS_INTEGER bnr, LIS_INTEGER bnc,|\\
\verb|         LIS_INTEGER bnnz, LIS_INTEGER bptr(), LIS_INTEGER bindex(),|\\
\verb|         LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the BSR format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt bnr] The row block size
\item[\tt bnc] The column block size
\item[\tt bnnz] The number of nonzero blocks
\item[\tt bptr, bindex, value] The arrays in the BSR format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_bsr| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\subsubsection{lis\_matrix\_set\_bsc}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_bsc(LIS_INT bnr, LIS_INT bnc, LIS_INT bnnz,|\\
\verb|         LIS_INT bptr[], LIS_INT bindex[], LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_bsc(LIS_INTEGER bnr, LIS_INTEGER bnc,|\\
\verb|         LIS_INTEGER bnnz, LIS_INTEGER bptr(), LIS_INTEGER bindex(),|\\
\verb|         LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the BSC format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt bnr] The row block size
\item[\tt bnc] The column block size
\item[\tt bnnz] The number of nonzero blocks
\item[\tt bptr, bindex, value] The arrays in the BSC format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_bsc| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\newpage
\subsubsection{lis\_matrix\_set\_vbr}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_vbr(LIS_INT nnz, LIS_INT nr, LIS_INT nc,|\\
\verb|         LIS_INT bnnz, LIS_INT row[], LIS_INT col[], LIS_INT ptr[],|\\
\verb|         LIS_INT bptr[], LIS_INT bindex[], LIS_SCALAR value[],|\\
\verb|         LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_vbr(LIS_INTEGER nnz, LIS_INTEGER nr,|\\
\verb|         LIS_INTEGER nc, LIS_INTEGER bnnz, LIS_INTEGER row(),|\\
\verb|         LIS_INTEGER col(), LIS_INTEGER ptr(), LIS_INTEGER bptr(),|\\
\verb|         LIS_INTEGER bindex(), LIS_SCALAR value(), LIS_MATRIX A,|\\
\verb|         LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the VBR format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnz] The number of nonzero elements
\item[\tt nr] The number of row blocks
\item[\tt nc] The number of column blocks
\item[\tt bnnz] The number of nonzero blocks
\item[\tt row, col, ptr, bptr, bindex, value] The arrays in the VBR format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_vbr| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\newpage
\subsubsection{lis\_matrix\_set\_coo}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_coo(LIS_INT nnz, LIS_INT row[], LIS_INT col[],|\\
\verb|         LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_coo(LIS_INTEGER nnz, LIS_INTEGER row(),|\\
\verb|         LIS_INTEGER col(), LIS_SCALAR value(), LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the arrays in the COO format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nnz] The number of nonzero elements
\item[\tt row, col, value] The arrays in the COO format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_coo| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\newpage
\subsubsection{lis\_matrix\_set\_dns}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_dns(LIS_SCALAR value[], LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_set_dns(LIS_SCALAR value(), LIS_MATRIX A,|\\
\verb|        LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Associate the array in the DNS format with matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The array in the DNS format
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the array
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_set_dns| is called, 
the function \verb|lis_matrix_assemble| must be called. 
Array indexing must be zero-origin in the Fortran version.

\subsubsection{lis\_matrix\_unset}
\begin{screen}
\verb|C       LIS_INT lis_matrix_unset(LIS_MATRIX A)|\\
\verb|Fortran subroutine lis_matrix_unset(LIS_MATRIX A, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Unassociate the arrays from matrix $A$ without deallocating memory.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix associated with the arrays
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The unassociated matrix
\end{namelist}
\noindent
{\bf Note}\\
\indent
After \verb|lis_matrix_unset| is called, 
the function \verb|lis_matrix_destroy| must be called. 

\newpage
\subsection{Computing with Vectors and Matrices}
\subsubsection{lis\_vector\_swap}
\begin{screen}
\verb|C       LIS_INT lis_vector_swap(LIS_VECTOR x, LIS_VECTOR y)|\\
\verb|Fortran subroutine lis_vector_swap(LIS_VECTOR x, LIS_VECTOR y, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Swap the values of the vector elements.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x, y] The source vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x, y] The destination vectors
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_copy}
\begin{screen}
\verb|C       LIS_INT lis_vector_copy(LIS_VECTOR x, LIS_VECTOR y)|\\
\verb|Fortran subroutine lis_vector_copy(LIS_VECTOR x, LIS_VECTOR y, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Copy the values of the vector elements.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The source vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] The destination vector
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_axpy}
\begin{screen}
\verb|C       LIS_INT lis_vector_axpy(LIS_SCALAR alpha, LIS_VECTOR x, LIS_VECTOR y)|
\verb|Fortran subroutine lis_vector_axpy(LIS_SCALAR alpha, LIS_VECTOR x, LIS_VECTOR y,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the vectors $y = \alpha x + y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt alpha] The scalar value
\item[\tt x, y] The vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $\alpha x + y$ (vector $y$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_xpay}
\begin{screen}
\verb|C       LIS_INT lis_vector_xpay(LIS_VECTOR x, LIS_SCALAR alpha, LIS_VECTOR y)|
\verb|Fortran subroutine lis_vector_xpay(LIS_VECTOR x, LIS_SCALAR alpha, LIS_VECTOR y,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the vectors $y = x + \alpha y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt alpha] The scalar value
\item[\tt x, y] The vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $x + \alpha y$ (vector $y$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_axpyz}
\begin{screen}
\verb|C       LIS_INT lis_vector_axpyz(LIS_SCALAR alpha, LIS_VECTOR x, LIS_VECTOR y,|\\
\verb|         LIS_VECTOR z)|\\
\verb|Fortran subroutine lis_vector_axpyz(LIS_SCALAR alpha, LIS_VECTOR x, LIS_VECTOR y,|\\
\verb|         LIS_VECTOR z, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the vectors $z = \alpha x + y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt alpha] The scalar value
\item[\tt x, y] The vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt z] $\alpha x + y$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_scale}
\begin{screen}
\verb|C       LIS_INT lis_vector_scale(LIS_SCALAR alpha, LIS_VECTOR x)|
\verb|Fortran subroutine lis_vector_scale(LIS_SCALAR alpha, LIS_VECTOR x,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Multiply vector $x$ by scalar $\alpha$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt alpha] The scalar value
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] $\alpha x$ (vector $x$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_pmul}
\begin{screen}
\verb|C       LIS_INT lis_vector_pmul(LIS_VECTOR x, LIS_VECTOR y, LIS_VECTOR z)|
\verb|Fortran subroutine lis_vector_pmul(LIS_VECTOR x, LIS_VECTOR y, LIS_VECTOR z,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Multiply each element of vector $x$ by the corresponding element of $y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x, y] The vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt z] The vector that stores the multiplied elements of $x$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_pdiv}
\begin{screen}
\verb|C       LIS_INT lis_vector_pdiv(LIS_VECTOR x, LIS_VECTOR y, LIS_VECTOR z)|
\verb|Fortran subroutine lis_vector_pdiv(LIS_VECTOR x, LIS_VECTOR y, LIS_VECTOR z,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Divide each element of vector $x$ by the corresponding element of $y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x, y] The vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt z] The vector that stores the divided elements of $x$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_set\_all}
\begin{screen}
\verb|C       LIS_INT lis_vector_set_all(LIS_SCALAR value, LIS_VECTOR x)|
\verb|Fortran subroutine lis_vector_set_all(LIS_SCALAR value, LIS_VECTOR x,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign the scalar value to the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The scalar value to be assigned
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector with the value assigned to the elements
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_abs}
\begin{screen}
\verb|C       LIS_INT lis_vector_abs(LIS_VECTOR x)|\\
\verb|Fortran subroutine lis_vector_abs(LIS_VECTOR x, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the absolute values of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector that stores the absolute values
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_reciprocal}
\begin{screen}
\verb|C       LIS_INT lis_vector_reciprocal(LIS_VECTOR x)|\\
\verb|Fortran subroutine lis_vector_reciprocal(LIS_VECTOR x, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the reciprocal values of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector that stores the reciprocal values
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_conjugate}
\begin{screen}
\verb|C       LIS_INT lis_vector_conjugate(LIS_VECTOR x)|\\
\verb|Fortran subroutine lis_vector_conjugate(LIS_VECTOR x, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the conjugate complex values of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector that stores the conjugate complex values
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_shift}
\begin{screen}
\verb|C       LIS_INT lis_vector_shift(LIS_SCALAR sigma, LIS_VECTOR x)|\\
\verb|Fortran subroutine lis_vector_shift(LIS_SCALAR sigma, LIS_VECTOR x,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Shift vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt sigma] The amount of the shift
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector that stores the shifted elements $x_i-\sigma$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_dot}
\begin{screen}
\verb|C       LIS_INT lis_vector_dot(LIS_VECTOR x, LIS_VECTOR y, LIS_SCALAR *value)|
\verb|Fortran subroutine lis_vector_dot(LIS_VECTOR x, LIS_VECTOR y, LIS_SCALAR value,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the Hermitian inner product $x^{H}y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x, y] The vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The inner product
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_nhdot}
\begin{screen}
\verb|C       LIS_INT lis_vector_nhdot(LIS_VECTOR x, LIS_VECTOR y, LIS_SCALAR *value)|
\verb|Fortran subroutine lis_vector_nhdot(LIS_VECTOR x, LIS_VECTOR y, LIS_SCALAR value,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the non-Hermitian inner product $x^{T}y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x, y] The vectors
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The inner product
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_nrm1}
\begin{screen}
\verb|C       LIS_INT lis_vector_nrm1(LIS_VECTOR x, LIS_SCALAR *value)|\\
\verb|Fortran subroutine lis_vector_nrm1(LIS_VECTOR x, LIS_SCALAR value, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the 1-norm of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The 1-norm of the vector
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_nrm2}
\begin{screen}
\verb|C       LIS_INT lis_vector_nrm2(LIS_VECTOR x, LIS_REAL *value)|\\
\verb|Fortran subroutine lis_vector_nrm2(LIS_VECTOR x, LIS_REAL value, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the 2-norm of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The 2-norm of the vector
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_vector\_nrmi}
\begin{screen}
\verb|C       LIS_INT lis_vector_nrmi(LIS_VECTOR x, LIS_SCALAR *value)|\\
\verb|Fortran subroutine lis_vector_nrmi(LIS_VECTOR x, LIS_SCALAR value, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the infinity norm of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The infinity norm of the vector
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_vector\_sum}
\begin{screen}
\verb|C       LIS_INT lis_vector_sum(LIS_VECTOR x, LIS_SCALAR *value)|\\
\verb|Fortran subroutine lis_vector_sum(LIS_VECTOR x, LIS_SCALAR value, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The sum of the vector elements 
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_matrix\_set\_blocksize}
\begin{screen}
\verb|C       LIS_INT lis_matrix_set_blocksize(LIS_MATRIX A, LIS_INT bnr, LIS_INT bnc,|\\
\verb|         LIS_INT row[], LIS_INT col[])|\\
\verb|Fortran subroutine lis_matrix_set_blocksize(LIS_MATRIX A, LIS_INTEGER bnr,|\\
\verb|         LIS_INTEGER bnc, LIS_INTEGER row[], LIS_INTEGER col[], LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign the block size of the BSR, BSC, and VBR formats.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt bnr] The row block size of the BSR (BSC) format or the number of 
	     row blocks of the VBR format
\item[\tt bnc] The olumn block size of the BSR (BSC) format or the
	     number of column blocks of the VBR format
\item[\tt row] The array of the row division information about the VBR format
\item[\tt col] The array of the column division information about the
	     VBR format
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_matrix\_convert}
\begin{screen}
\verb|C       LIS_INT lis_matrix_convert(LIS_MATRIX Ain, LIS_MATRIX Aout)|\\
\verb|Fortran subroutine lis_matrix_convert(LIS_MATRIX Ain, LIS_MATRIX Aout,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Convert matrix $A_{in}$ into $A_{out}$ of the format specified by {\tt lis\_matrix\_set\_type}.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt Ain] The source matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt Aout] The destination matrix
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The storage format of $A_{out}$ is set by \verb|lis_matrix_set_type|. 
The block size of the BSR, BSC, and VBR formats is set by \verb|lis_matrix_set_blocksize|. See {\tt lis-(\$VERSION)/test/test2.c} and
{\tt lis-(\$VERSION)/test/test2f.F90}.

The conversions indicated by 1 in the table below are performed directly, 
and the others are performed via the indicated formats. 
The conversions with no indication are performed via the CSR format.
\vspace*{5mm}

\begin{tabular}{|c|c|c|c|c|c|c|c|c|c|c|c|}
\hline
Src \textbackslash Dst & CSR & CSC & MSR & DIA & ELL & JAD & BSR & BSC & VBR & COO & DNS \\ \hline
CSR    &     &  1  &  1  &  1  &  1  &  1  &  1  &  CSC  &  1  &  1  &  1  \\ \hline
COO    &  1  &  1  &  1  & CSR  & CSR & CSR & CSR & CSC & CSR &     & CSR   \\ \hline
\end{tabular}

\newpage
\subsubsection{lis\_matrix\_copy}
\begin{screen}
\verb|C       LIS_INT lis_matrix_copy(LIS_MATRIX Ain, LIS_MATRIX Aout)|
\verb|Fortran subroutine lis_matrix_copy(LIS_MATRIX Ain, LIS_MATRIX Aout,|\\
\verb|         LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Copy the values of the matrix elements.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt Ain] The source matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt Aout] The destination matrix
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_matrix\_axpy}
\begin{screen}
\verb|C       LIS_INT lis_matrix_axpy(LIS_SCALAR alpha, LIS_MATRIX A, LIS_MATRIX B)|\\
\verb|Fortran subroutine lis_matrix_axpy(LIS_SCALAR alpha, LIS_MATRIX A, LIS_MATRIX B,|\\
\verb|         LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the matrices $B = \alpha A + B$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt alpha] The scalar value
\item[\tt A, B] The matrices
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt B] $\alpha A + B$ (matrix $B$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}
\indent
Matrices $A$, $B$ must be in the DNS format.

\newpage
\subsubsection{lis\_matrix\_xpay}
\begin{screen}
\verb|C       LIS_INT lis_matrix_xpay(LIS_SCALAR alpha, LIS_MATRIX A, LIS_MATRIX B)|\\
\verb|Fortran subroutine lis_matrix_xpay(LIS_SCALAR alpha, LIS_MATRIX A, LIS_MATRIX B,|\\
\verb|         LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the matrices $B = A + \alpha B$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt alpha] The scalar value
\item[\tt A, B] The matrices
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt B] $A + \alpha B$ (matrix $B$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Matrices $A$, $B$ must be in the DNS format.

\subsubsection{lis\_matrix\_axpyz}
\begin{screen}
\verb|C       LIS_INT lis_matrix_axpyz(LIS_SCALAR alpha, LIS_MATRIX A, LIS_MATRIX B,|\\
\verb|         LIS_MATRIX C)|\\
\verb|Fortran subroutine lis_matrix_axpyz(LIS_SCALAR alpha, LIS_MATRIX A, LIS_MATRIX B,|\\
\verb|         LIS_MATRIX C, LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the matrices $C = \alpha A + B$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt alpha] The scalar value
\item[\tt A, B] The matrices
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt C] $\alpha A + B$
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Matrices $A$, $B$, and $C$ must be in the DNS format.

\newpage
\subsubsection{lis\_matrix\_scale}
\begin{screen}
\verb|C       LIS_INT lis_matrix_scale(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR d,|\\
\verb|         LIS_INT action)|\\
\verb|Fortran subroutine lis_matrix_scale(LIS_MATRIX A, LIS_VECTOR b,|\\
\verb|         LIS_VECTOR d, LIS_INTEGER action, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Scale matrix $A$ and vector $b$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt b] The vector
\item[\tt action] \begin{description}
\item[\tt LIS\_SCALE\_JACOBI]: Jacobi scaling $D^{-1}Ax=D^{-1}b$, where $D$
	   represents the diagonal of $A=(a_{ij})$
\item[\tt LIS\_SCALE\_SYMM\_DIAG]: Diagonal scaling
	   $D^{-1/2}AD^{-1/2}x=D^{-1/2}b$, where $D^{-1/2}$ represents
	   a diagonal matrix with $1/\sqrt{a_{ii}}$ as the diagonal
\end{description}
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The scaled matrix
\item[\tt b] The scaled vector
\item[\tt d]  The vector that stores the diagonal elements of $D^{-1}$ or $D^{-1/2}$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_matrix\_get\_diagonal}
\begin{screen}
\verb|C       LIS_INT lis_matrix_get_diagonal(LIS_MATRIX A, LIS_VECTOR d)|\\
\verb|Fortran subroutine lis_matrix_get_diagonal(LIS_MATRIX A, LIS_VECTOR d,|\\
\verb|         LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Store the diagonal elements of matrix $A$ to vector $d$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt d] The vector that stores the diagonal elements of the matrix
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_matrix\_shift\_diagonal}
\begin{screen}
\verb|C       LIS_INT lis_matrix_shift_diagonal(LIS_MATRIX A, LIS_SCALAR sigma)|\\
\verb|Fortran subroutine lis_matrix_shift_diagonal(LIS_MATRIX A, LIS_SCALAR sigma,|\\
\verb|         LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Shift the diagonal elements of matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt sigma] The amount of the shift
\item[\tt A] The matrix
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The shifted matrix $A-\sigma E$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_matrix\_shift\_matrix}
\begin{screen}
\verb|C       LIS_INT lis_matrix_shift_matrix(LIS_MATRIX A, LIS_MATRIX B,|\\
\verb|         LIS_SCALAR sigma)|\\
\verb|Fortran subroutine lis_matrix_shift_matrix(LIS_MATRIX A, LIS_MATRIX B,|\\\verb|         LIS_SCALAR sigma, LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Shift the matrix elements of matrix $A$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt sigma] The amount of the shift
\item[\tt A] The matrix
\item[\tt B] The matrix  
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The shifted matrix $A-\sigma B$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_matvec}
\begin{screen}
\verb|C       LIS_INT lis_matvec(LIS_MATRIX A, LIS_VECTOR x, LIS_VECTOR y)|\\
\verb|Fortran subroutine lis_matvec(LIS_MATRIX A, LIS_VECTOR x, LIS_VECTOR y,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the matrix-vector product $y=Ax$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $Ax$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_matvech}
\begin{screen}
\verb|C       LIS_INT lis_matvech(LIS_MATRIX A, LIS_VECTOR x, LIS_VECTOR y)|\\
\verb|Fortran subroutine lis_matvech(LIS_MATRIX A, LIS_VECTOR x, LIS_VECTOR y,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the matrix-vector product $y=A^{H}x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt x] The vector
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $A^{H}x$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsection{Solving Linear Equations}
\subsubsection{lis\_solver\_create}
\begin{screen}
\verb|C       LIS_INT lis_solver_create(LIS_SOLVER *solver)|\\
\verb|Fortran subroutine lis_solver_create(LIS_SOLVER solver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Create the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None]
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
\verb|solver| has the information on the solver, the preconditioner, etc.

\subsubsection{lis\_solver\_destroy}
\begin{screen}
\verb|C       LIS_INT lis_solver_destroy(LIS_SOLVER solver)|\\
\verb|Fortran subroutine lis_solver_destroy(LIS_SOLVER solver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Destroy the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver to be destroyed
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_precon\_create}
\begin{screen}
\verb|C       LIS_INT lis_precon_create(LIS_SOLVER solver, LIS_PRECON *precon)|\\
\verb|Fortran subroutine lis_precon_create(LIS_SOLVER solver, LIS_PRECON precon,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Create the preconditioner.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None]
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\item[\tt precon] The preconditioner
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_precon\_destroy}
\begin{screen}
\verb|C       LIS_INT lis_precon_destroy(LIS_PRECON precon)|\\
\verb|Fortran subroutine lis_precon_destroy(LIS_PRECON precon, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Destroy the preconditioner.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt precon] The preconditioner to be destroyed
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_solver\_set\_option}
  \label{sec:setoptions}
\begin{screen}
\verb|C       LIS_INT lis_solver_set_option(char *text, LIS_SOLVER solver)|
\verb|Fortran subroutine lis_solver_set_option(character text, LIS_SOLVER solver,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Set the options for the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt text] The command line options
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The table below shows the available command line options, 
where \verb=-i {cg|1}= means \verb=-i cg= or \verb=-i 1= and \verb=-maxiter [1000]= indicates 
that \verb=-maxiter= defaults to $1,000$.
\\
\\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Linear Solvers} (Default: \verb=-i bicg=) \\
\begin{tabular}{l|lll}\hline\hline
 Solver      & Option              &  Auxiliary Options  & \\ \hline
 CG          & \verb=-i {cg|1}=         &    \\ 
 BiCG        & \verb=-i {bicg|2}=       &    \\
 CGS         & \verb=-i {cgs|3}=        &    \\
 BiCGSTAB    & \verb=-i {bicgstab|4}=   &    \\
 BiCGSTAB(l) & \verb=-i {bicgstabl|5}=  & \verb=-ell [2]=      & The degree $l$ \\
 GPBiCG      & \verb=-i {gpbicg|6}=     &    \\
 TFQMR       & \verb=-i {tfqmr|7}=      &    \\
 Orthomin(m) & \verb=-i {orthomin|8}=   & \verb=-restart [40]= & The restart
 value $m$  \\
 GMRES(m)    & \verb=-i {gmres|9}=      & \verb=-restart [40]= & The restart value $m$  \\ 
 Jacobi      & \verb=-i {jacobi|10}=    &    \\
 Gauss-Seidel& \verb=-i {gs|11}=        &    \\
 SOR         & \verb=-i {sor|12}=       & \verb=-omega [1.9]=  & The relaxation coefficient \\
             &                          &                      & $\omega$ ($0<\omega<2$) \\
 BiCGSafe    & \verb=-i {bicgsafe|13}=     &    \\
 CR          & \verb=-i {cr|14}=        &    \\ 
 BiCR        & \verb=-i {bicr|15}=      &    \\
 CRS         & \verb=-i {crs|16}=       &    \\
 BiCRSTAB    & \verb=-i {bicrstab|17}=  &    \\
 GPBiCR      & \verb=-i {gpbicr|18}=    &    \\
 BiCRSafe    & \verb=-i {bicrsafe|19}=  &    \\
 FGMRES(m)   & \verb=-i {fgmres|20}=    & \verb=-restart [40]= & The restart value $m$   \\ 
 IDR(s)      & \verb=-i {idrs|21}=      & \verb=-irestart [2]= & The restart
 value $s$  \\
 IDR(1)      & \verb=-i {idr1|22}=      &    \\ 
 MINRES      & \verb=-i {minres|23}=    &    \\
 COCG        & \verb=-i {cocg|24}=      &    \\
 COCR        & \verb=-i {cocr|25}=      &    \\   
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Preconditioners} (Default: \verb=-p none=)\\
\begin{tabular}{l|lll}\hline\hline
Preconditioner   & Option           & Auxiliary Options \\ \hline
None     & \verb=-p {none|0}=    &   \\
Jacobi   & \verb=-p {jacobi|1}=  &     \\
ILU(k)   & \verb=-p {ilu|2}=     & \verb=-ilu_fill [0]=        & The fill level $k$ \\
SSOR     & \verb=-p {ssor|3}=    & \verb=-ssor_omega [1.0]=    & The relaxation coefficient \\
         &                       &                             & $\omega$ ($0<\omega<2$) \\
Hybrid   & \verb=-p {hybrid|4}=  & \verb=-hybrid_i [sor]=      & The linear solver\\
         &                       & \verb=-hybrid_maxiter [25]= & The maximum number of iterations \\
         &                       & \verb=-hybrid_tol [1.0e-3]= & The convergence tolerance \\
         &                       & \verb=-hybrid_omega [1.5]=  & The relaxation coefficient $\omega$ \\
         &                       &                             & of the SOR ($0<\omega<2$) \\
         &                       & \verb=-hybrid_ell [2]=      & The degree $l$ of the BiCGSTAB(l) \\
         &                       & \verb=-hybrid_restart [40]= & The restart values \\
         &                       &                             & of the GMRES and Orthomin \\
I+S      & \verb=-p {is|5}=      & \verb=-is_alpha [1.0]=      & The parameter $\alpha$ of $I+\alpha S^{(m)}$ \\
         &                       & \verb=-is_m [3]=            & The parameter $m$ of $I+\alpha S^{(m)}$ \\
SAINV    & \verb=-p {sainv|6}=   & \verb=-sainv_drop [0.05]=   & The drop criterion\\
SA-AMG   & \verb=-p {saamg|7}=   & \verb=-saamg_unsym [false]= & Select the unsymmetric version    \\
         &                       &                             & (The matrix structure must be \\
         &                       &                             & symmetric)    \\
         &                       & \verb=-saamg_theta [0.05|0.12]= & The drop criterion $a^2_{ij}\le\theta^2|a_{ii}||a_{jj}|$ \\
         &                       &                             & (symmetric or unsymmetric) \\
Crout ILU& \verb=-p {iluc|8}=    & \verb=-iluc_drop [0.05]=    & The drop criterion    \\
&                       & \verb=-iluc_rate [5.0]=     & The ratio of the maximum fill-in \\
ILUT     & \verb=-p {ilut|9}=    &     \\
Additive & \verb=-adds true=     & \verb=-adds_iter [1]=       & The number of iterations   \\
Schwarz  &                       &                             &                            \\
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\newpage
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Other Options}\\
\begin{tabular}{l|ll}\hline\hline
Option &                          \\ \hline
\verb=-maxiter [1000]= & The maximum number of iterations         \\ 
\verb=-tol [1.0e-12]=  & The convergence tolerance $tol$            \\
\verb=-tol_w [1.0]=    & The convergence tolerance $tol_w$  \\
\verb=-print [0]=      & The output of the residual history                \\
                       & \verb=-print {none|0}     =  None \\
                       & \verb=-print {mem|1}      =  Save the residual history\\
                       & \verb=-print {out|2}      =  Output it to the standard output\\
                       & \verb=-print {all|3}      =  Save the residual history and output it \\ 
                       & \verb=                    =  to the standard output \\
\verb=-scale [0]=      & The scaling \\
                       & (The result will overwrite the original matrix and vectors) \\
                       & \verb=-scale {none|0}     =  No scaling \\ 
                       & \verb=-scale {jacobi|1}   =  The Jacobi scaling $D^{-1}Ax=D^{-1}b$ \\
                       & \verb=                    =  ($D$ represents the diagonal of $A=(a_{ij})$)\\
                       & \verb=-scale {symm_diag|2}=  The diagonal scaling $D^{-1/2}AD^{-1/2}x=D^{-1/2}b$ \\
                       & \verb=                    =  ($D^{-1/2}$ represents the diagonal matrix \\
                       & \verb=                    =  with $1/\sqrt{a_{ii}}$ as the diagonal) \\ 
\verb=-initx_zeros [1]= & The behavior of the initial vector $x_{0}$  \\
                       & \verb=-initx_zeros {false|0}     =  The components are given by the argument \verb=x= \\
                       & \verb=                           =  of the function \verb=lis_solve()= \\
                       & \verb=-initx_zeros {true|1}      =  All the components are set to $0$ \\
\verb=-conv_cond [0]= & The convergence condition  \\
                       & \verb=-conv_cond {nrm2_r|0}     =  $||b-Ax||_2 \le tol * ||b-Ax_0||_2$ \\
                       & \verb=-conv_cond {nrm2_b|1}     =  $||b-Ax||_2 \le tol * ||b||_2$ \\
                       & \verb=-conv_cond {nrm1_b|2}     =  $||b-Ax||_1 \le tol_w * ||b||_1 + tol$\\
\verb=-omp_num_threads [t]= & The number of threads        \\ 
                            & (\verb=t= represents the maximum number of
 threads) \\
\verb=-storage [0]=    & The matrix storage format \\
\verb=-storage_block [2]=& The block size of the BSR and BSC formats\\ 
\verb=-f [0]=          & The precision of the linear solver\\
                       & \verb=-f {double|0}       =  Double precision \\ 
                       & \verb=-f {quad|1}         =  Double-double (quadruple) precision \\
\hline         
\end{tabular}
\end{center}
\end{minipage}

\newpage
\subsubsection{lis\_solver\_set\_optionC}
\begin{screen}
\verb|C       LIS_INT lis_solver_set_optionC(LIS_SOLVER solver)|\\
\verb|Fortran subroutine lis_solver_set_optionC(LIS_SOLVER solver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Set the options for the solver on the command line.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None]
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_solve}
\begin{screen}
\verb|C       LIS_INT lis_solve(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
\verb|         LIS_SOLVER solver)|\\
\verb|Fortran subroutine lis_solve(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
\verb|         LIS_SOLVER solver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Solve the linear equation $Ax = b$ with the specified solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The coefficient matrix
\item[\tt b] The right-hand side vector
\item[\tt x] The initial vector
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The solution
\item[\tt solver] The number of iterations, the execution time, etc.
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
If the option {\tt -initx\_zeros \{false|0\}} is specified, the initial
vector is given by the argument {\tt x}.
Otherwise, all the components of the initial vector are set to $0$.

This function returns 0 if the status of the solver ({\tt solver->retcode})
is {\tt LIS\_BREAKDOWN} or {\tt LIS\_MAXITER}. See also the function
{\tt lis\_solver\_get\_status()}. 

\newpage
\subsubsection{lis\_solve\_kernel}
\begin{screen}
\verb|C       LIS_INT lis_solve_kernel(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
\verb|         LIS_SOLVER solver, LIS_PRECON, precon)|\\
\verb|Fortran subroutine lis_solve_kernel(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
\verb|         LIS_SOLVER solver, LIS_PRECON precon, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Solve the linear equation $Ax = b$ with the specified solver and the predefined preconditioner.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The coefficient matrix
\item[\tt b] The right-hand side vector
\item[\tt x] The initial vector
\item[\tt solver] The solver
\item[\tt precon] The preconditioner
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The solution
\item[\tt solver] The number of iterations, the execution time, etc.
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
See {\tt lis-(\$VERSION)/src/esolver/lis\_esolver\_ii.c}, 
which computes the smallest eigenvalue by calling 
\verb|lis_solve_kernel| multiple times, for example. 

This function returns 0 if the status of the solver ({\tt solver->retcode})
is {\tt LIS\_BREAKDOWN} or {\tt LIS\_MAXITER}. See also the function
{\tt lis\_solver\_get\_status()}. 

\newpage
\subsubsection{lis\_solver\_get\_status}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_status(LIS_SOLVER solver, LIS_INT *status)|\\
\verb|Fortran subroutine lis_solver_get_status(LIS_SOLVER solver, LIS_INTEGER status,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the status from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt status] The status
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
This function returns the status of the solver ({\tt solver->retcode}).

\subsubsection{lis\_solver\_get\_iter}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_iter(LIS_SOLVER solver, LIS_INT *iter)|\\
\verb|Fortran subroutine lis_solver_get_iter(LIS_SOLVER solver, LIS_INTEGER iter,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the number of iterations from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt iter] The number of iterations
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_solver\_get\_iterex}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_iterex(LIS_SOLVER solver, LIS_INT *iter,|\\
\verb|         LIS_INT *iter_double, LIS_INT *iter_quad)|\\
\verb|Fortran subroutine lis_solver_get_iterex(LIS_SOLVER solver, LIS_INTEGER iter,|\\
\verb|         LIS_INTEGER iter_double, LIS_INTEGER iter_quad, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the detailed information on the number of iterations from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt iter] The number of iterations
\item[\tt iter\_double] The number of double precision iterations
\item[\tt iter\_quad] The number of double-double (quadruple) precision iterations
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_solver\_get\_time}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_time(LIS_SOLVER solver, double *time)|\\
\verb|Fortran subroutine lis_solver_get_time(LIS_SOLVER solver, real*8 time,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the execution time from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt time] The time in seconds of the execution
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_solver\_get\_timeex}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_timeex(LIS_SOLVER solver, double *time,|\\
\verb|         double *itime, double *ptime, double *p_c_time, double *p_i_time)|\\
\verb|Fortran subroutine lis_solver_get_timeex(LIS_SOLVER solver, real*8 time,|\\
\verb|         real*8 itime, real*8 ptime, real*8 p_c_time, real*8 p_i_time,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the detailed information on the execution time from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt time] The total time in seconds
\item[\tt itime] The time in seconds of the iterations
\item[\tt ptime] The time in seconds of the preconditioning
\item[\tt p\_c\_time] The time in seconds of the creation of the preconditioner
\item[\tt p\_i\_time] The time in seconds of the iterations in the preconditioner
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_solver\_get\_residualnorm}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_residualnorm(LIS_SOLVER solver, LIS_REAL *residual)|\\
\verb|Fortran subroutine lis_solver_get_residualnorm(LIS_SOLVER solver,|\\
\verb|         LIS_REAL residual, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the relative residual norm $||b - Ax||_2 / ||b||_2$ from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt residual]  The relative residual norm $||b - Ax||_2 / ||b||_2$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_solver\_get\_rhistory}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_rhistory(LIS_SOLVER solver, LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_solver_get_rhistory(LIS_SOLVER solver, LIS_VECTOR v,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the residual history from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Vector $v$ must be created in advance with the function \verb|lis_vector_create|. 
When vector $v$ is shorter than the residual history, 
it stores the residual history in order to vector $v$.

\newpage
\subsubsection{lis\_solver\_get\_solver}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_solver(LIS_SOLVER solver, LIS_INT *nsol)|\\
\verb|Fortran subroutine lis_solver_get_solver(LIS_SOLVER solver, LIS_INTEGER nsol,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the solver number from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nsol] The solver number
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_solver\_get\_precon}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_precon(LIS_SOLVER solver, LIS_INT *precon_type)|\\
\verb|Fortran subroutine lis_solver_get_precon(LIS_SOLVER solver, LIS_INTEGER precon_type,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the preconditioner number from the solver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt solver] The solver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt precon\_type] The preconditioner number
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_solver\_get\_solvername}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_solvername(LIS_INT nsol, char *name)|\\
\verb|Fortran subroutine lis_solver_get_solvername(LIS_INTEGER nsol, character name,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the solver name from the solver number.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nsol] The solver number
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt name] The solver name
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_solver\_get\_preconname}
\begin{screen}
\verb|C       LIS_INT lis_solver_get_preconname(LIS_INT precon_type, char *name)|\\
\verb|Fortran subroutine lis_solver_get_preconname(LIS_INTEGER precon_type,|\\
\verb|         character name, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the preconditioner name from the preconditioner number.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt precon\_type] The preconditioner number
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt name] The preconditioner name
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsection{Solving Eigenvalue Problems}
\subsubsection{lis\_esolver\_create}
\begin{screen}
\verb|C       LIS_INT lis_esolver_create(LIS_ESOLVER *esolver)|\\
\verb|Fortran subroutine lis_esolver_create(LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Create the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None]
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
\verb|esolver| has the information on the eigensolver, the preconditioner, etc.

\subsubsection{lis\_esolver\_destroy}
\begin{screen}
\verb|C       LIS_INT lis_esolver_destroy(LIS_ESOLVER esolver)|\\
\verb|Fortran subroutine lis_esolver_destroy(LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Destroy the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver to be destoyed
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_esolver\_set\_option}
  \label{sec:setoptions}
\begin{screen}
\verb|C       LIS_INT lis_esolver_set_option(char *text, LIS_ESOLVER esolver)|
\verb|Fortran subroutine lis_esolver_set_option(character text, LIS_ESOLVER esolver,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Set the options for the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt text] The command line options
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The table below shows the available command line options, 
where \verb=-e {pi|1}= means \verb=-e pi= or \verb=-e 1= and \verb=-emaxiter [1000]= indicates 
that \verb=-emaxiter= defaults to $1,000$.
\\
\\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Eigensolvers} (Default: \verb=-e cr=) \\
\begin{tabular}{l|lll}\hline\hline
 Eigensolver      & Option              &  Auxiliary Options  & \\ \hline
\hline
 Power                             & \verb=-e {pi|1}=        &    \\ 
 Inverse                           & \verb=-e {ii|2}=        &
 \verb=-i [bicg]= & The linear solver \\
 Rayleigh Quotient                 & \verb=-e {rqi|3}=       &
 \verb=-i [bicg]= & The linear solver \\
 CG                                & \verb=-e {cg|4}=        &
 \verb=-i [cg]= & The linear solver \\ 
 CR                                & \verb=-e {cr|5}=        &
 \verb=-i [bicg]= & The linear solver \\ 
 Subspace                          & \verb=-e {si|6}=        &
 \verb=-ss [1]= & The size of the subspace \\
 Lanczos                           & \verb=-e {li|7}=        &
 \verb=-ss [1]= & The size of the subspace \\
 Arnoldi                           & \verb=-e {ai|8}=        &
 \verb=-ss [1]= & The size of the subspace \\
 Generalized Power                 & \verb=-e {gpi|9}=      &
 \verb=-i [bicg]= & The linear solver \\ 
 Generalized Inverse               & \verb=-e {gii|10}=      & 
 \verb=-i [bicg]= & The linear solver \\
 Generalized Rayleigh Quotient     & \verb=-e {grqi|11}=      & 
 \verb=-i [bicg]= & The linear solver \\ 
 Generalized CG                    & \verb=-e {gcg|12}=      & 
 \verb=-i [cg]= & The linear solver \\
 Generalized CR                    & \verb=-e {gcr|13}=      & 
 \verb=-i [bicg]= & The linear solver \\
 Generalized Subspace              & \verb=-e {gsi|14}=      &
 \verb=-ss [1]= & The size of the subspace \\
 Generalized Lanczos               & \verb=-e {gli|15}=      &
 \verb=-ss [1]= & The size of the subspace \\
 Generalized Arnoldi               & \verb=-e {gai|16}=      &
 \verb=-ss [1]= & The size of the subspace \\  
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Options for Preconditioners} (Default: \verb=-p none=)\\
\begin{tabular}{l|lll}\hline\hline
Preconditioner   & Option           & Auxiliary Options \\ \hline
None     & \verb=-p {none|0}=    &   \\
Jacobi   & \verb=-p {jacobi|1}=  &     \\
ILU(k)   & \verb=-p {ilu|2}=     & \verb=-ilu_fill [0]=        & The fill level $k$ \\
SSOR     & \verb=-p {ssor|3}=    & \verb=-ssor_omega [1.0]=    & The relaxation coefficient \\ 
         &                       &                             & $\omega$ ($0<\omega<2$) \\
Hybrid   & \verb=-p {hybrid|4}=  & \verb=-hybrid_i [sor]=      & The linear solver\\
         &                       & \verb=-hybrid_maxiter [25]= & The maximum number of iterations \\
         &                       & \verb=-hybrid_tol [1.0e-3]= & The convergence tolerance \\
         &                       & \verb=-hybrid_omega [1.5]=  & The relaxation coefficient $\omega$ \\
         &                       &                             & of the SOR ($0<\omega<2$) \\
         &                       & \verb=-hybrid_ell [2]=      & The degree $l$ of the BiCGSTAB(l) \\
         &                       & \verb=-hybrid_restart [40]= & The restart values \\
         &                       &                             & of the GMRES and Orthomin \\
I+S      & \verb=-p {is|5}=      & \verb=-is_alpha [1.0]=      & The parameter $\alpha$ of $I+\alpha S^{(m)}$ \\
         &                       & \verb=-is_m [3]=            & The parameter $m$ of $I+\alpha S^{(m)}$ \\
SAINV    & \verb=-p {sainv|6}=   & \verb=-sainv_drop [0.05]=   & The drop criterion\\
SA-AMG   & \verb=-p {saamg|7}=   & \verb=-saamg_unsym [false]= & Select the unsymmetric version    \\
         &                       &                             & (The matrix structure must be \\
         &                       &                             & symmetric)    \\
         &                       & \verb=-saamg_theta [0.05|0.12]= & The drop criterion $a^2_{ij}\le\theta^2|a_{ii}||a_{jj}|$ \\
         &                       &                             & (symmetric or unsymmetric) \\
Crout ILU& \verb=-p {iluc|8}=    & \verb=-iluc_drop [0.05]=    & The drop criterion    \\
         &                       & \verb=-iluc_rate [5.0]=     & The ratio of the maximum fill-in \\
ILUT     & \verb=-p {ilut|9}=    &     \\
Additive & \verb=-adds true=     & \verb=-adds_iter [1]=       & The number of iterations   \\
Schwarz  &                       &                             &                            \\
\hline         
\end{tabular}
\end{center}
\end{minipage}
\\ \\
\begin{minipage}[t]{\textwidth}
\begin{center}
{\bf Other Options}\\
\begin{tabular}{l|ll}\hline\hline
Option &                          \\ \hline
\verb=-emaxiter [1000]= & The maximum number of iterations         \\ 
\verb=-etol [1.0e-12]=  & The convergence tolerance          \\
\verb=-eprint [0]=      & The output of the residual history                \\
                       & \verb=-eprint {none|0}     =  None \\
                       & \verb=-eprint {mem|1}      =  Save the residual history\\
                       & \verb=-eprint {out|2}      =  Output it to the standard output\\
                       & \verb=-eprint {all|3}      =  Save the residual history and output it \\
                       & \verb=                     =  to the standard output\\
\verb=-ie [ii]= & The inner eigensolver used in Subspace, Lanczos, and Arnoldi\\
\verb=-ige [gii]= & The inner eigensolver used in Generalized Subspace, Generalized Lanczos, \\
                       & and Generalized Arnoldi\\
\verb=-shift [0.0]= & The amount of the real part of the shift $\sigma$ to compute $A-\sigma B$ \\
\verb=-shift_im [0.0]= & The amount of the imaginary part of the shift $\sigma$ \\
\verb=-initx_ones [1]= & The behavior of the initial vector $x_{0}$  \\
                       & \verb=-initx_ones {false|0}     =  The components are given by the argument \verb=x= \\
                       & \verb=                          =  of the function \verb=lis_esolve()= \\
                       & \verb=-initx_ones {true|1}      =  All the components are set to $1$ \\
\verb=-omp_num_threads [t]= & The number of threads        \\ 
                            & (\verb=t= represents the maximum number of
 threads) \\
\verb=-estorage [0]=   & The matrix storage format \\
\verb=-estorage_block [2]=& The block size of the BSR and BSC formats\\ 
\verb=-ef [0]=         & The precision of the eigensolver\\
                       & \verb=-ef {double|0}       =  Double precision \\ 
                       & \verb=-ef {quad|1}         =  Double-double (quadruple) precision \\
\verb=-rval [0]=       & The Ritz values \\
                       & \verb=-rval {false|0}     =  The eigenpairs are computed based on the Ritz values \\
                       & \verb=-rval {true|1}      =  Only the Ritz values are computed \\
\hline         
\end{tabular}
\end{center}
\end{minipage}

\newpage
\subsubsection{lis\_esolver\_set\_optionC}
\begin{screen}
\verb|C       LIS_INT lis_esolver_set_optionC(LIS_ESOLVER esolver)|\\
\verb|Fortran subroutine lis_esolver_set_optionC(LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Set the options for the eigensolver on the command line.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None]
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_esolve}
\begin{screen}
\verb|C       LIS_INT lis_esolve(LIS_MATRIX A, LIS_VECTOR x,|\\ 
\verb|         LIS_REAL evalue, LIS_ESOLVER esolver)|\\
\verb|Fortran subroutine lis_esolve(LIS_MATRIX A, LIS_VECTOR x,|\\
\verb|         LIS_REAL evalue, LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Solve the standard eigenvalue problem $Ax = \lambda x$ with the specified eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt x] The initial vector
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt evalue] The eigenvalue of mode 0
\item[\tt x] The associated eigenvector
\item[\tt esolver] The number of iterations, the execution time, etc.
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
If the option {\tt -initx\_ones \{false|0\}} is specified, the initial
vector is given by the argument {\tt x}.
Otherwise, all the components of the initial vector are set to $1$. 

This function returns 0 if the status of the eigensolver ({\tt esolver->retcode})
is {\tt LIS\_MAXITER}. See also the function
{\tt lis\_esolver\_get\_status()}. 

\newpage
\subsubsection{lis\_gesolve}
\begin{screen}
\verb|C       LIS_INT lis_gesolve(LIS_MATRIX A, LIS_MATRIX B,|\\ 
\verb|         LIS_VECTOR x, LIS_REAL evalue, LIS_ESOLVER esolver)|\\
\verb|Fortran subroutine lis_gesolve(LIS_MATRIX A, LIS_MATRIX B,|\\
\verb|         LIS_VECTOR x, LIS_REAL evalue, LIS_ESOLVER esolver, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Solve the generalized eigenvalue problem $Ax = \lambda Bx$ with the specified eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt B] The matrix  
\item[\tt x] The initial vector
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt evalue] The eigenvalue of mode 0
\item[\tt x] The associated eigenvector
\item[\tt esolver] The number of iterations, the execution time, etc.
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
If the option {\tt -initx\_ones \{false|0\}} is specified, the initial
vector is given by the argument {\tt x}.
Otherwise, all the components of the initial vector are set to $1$. 

This function returns 0 if the status of the eigensolver ({\tt esolver->retcode})
is {\tt LIS\_MAXITER}. See also the function
{\tt lis\_esolver\_get\_status()}. 

\newpage
\subsubsection{lis\_esolver\_get\_status}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_status(LIS_ESOLVER esolver, LIS_INT *status)|\\
\verb|Fortran subroutine lis_esolver_get_status(LIS_ESOLVER esolver, LIS_INTEGER status,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the status for the specified eigenpair from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt status] The status
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
This function returns the status of the eigensolver ({\tt esolver->retcode}).

\subsubsection{lis\_esolver\_get\_iter}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_iter(LIS_ESOLVER esolver, LIS_INT *iter)|\\
\verb|Fortran subroutine lis_esolver_get_iter(LIS_ESOLVER esolver, LIS_INTEGER iter,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the number of iterations for the specified eigenpair from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt iter] The number of iterations
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_esolver\_get\_iterex}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_iterex(LIS_ESOLVER esolver, LIS_INT *iter,|\\
\verb|         LIS_INT *iter_double, LIS_INT *iter_quad)|\\
\verb|Fortran subroutine lis_esolver_get_iterex(LIS_ESOLVER esolver, LIS_INTEGER iter,|\\
\verb|         LIS_INTEGER iter_double, LIS_INTEGER iter_quad, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the detailed information on the number of iterations for the specified eigenpair from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt iter] The number of iterations
\item[\tt iter\_double] The number of double precision iterations
\item[\tt iter\_quad] The number of double-double (quadruple) precision iterations
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_esolver\_get\_time}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_time(LIS_ESOLVER esolver, double *time)|\\
\verb|Fortran subroutine lis_esolver_get_time(LIS_ESOLVER esolver, real*8 time,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the execution time for the specified eigenpair from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt time] The time in seconds of the execution
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_esolver\_get\_timeex}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_timeex(LIS_ESOLVER esolver, double *time,|\\
\verb|         double *itime, double *ptime, double *p_c_time, double *p_i_time)|\\
\verb|Fortran subroutine lis_esolver_get_timeex(LIS_ESOLVER esolver, real*8 time,|\\
\verb|         real*8 itime, real*8 ptime, real*8 p_c_time, real*8 p_i_time,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the detailed information on the execution time for the specified eigenpair from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt time] The total time in seconds
\item[\tt itime] The time in seconds of the iterations
\item[\tt ptime] The time in seconds of the preconditioning
\item[\tt p\_c\_time] The time in seconds of the creation of the preconditioner
\item[\tt p\_i\_time] The time in seconds of the iterations in the preconditioner
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_esolver\_get\_residualnorm}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_residualnorm(LIS_ESOLVER esolver,|\\
\verb|         LIS_REAL *residual)|\\
\verb|Fortran subroutine lis_esolver_get_residualnorm(LIS_ESOLVER esolver,|\\
\verb|         LIS_REAL residual, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the relative residual norm $||\lambda x-(B^{-1})Ax||_2/||\lambda x||_2$ for the specified eigenpair from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt residual]  The relative residual norm $||\lambda x-Ax||_2/||\lambda x||_2$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_esolver\_get\_rhistory}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_rhistory(LIS_ESOLVER esolver, LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_esolver_get_rhistory(LIS_ESOLVER esolver, LIS_VECTOR v,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the residual history for the specified eigenpair from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Vector $v$ must be created in advance with the function \verb|lis_vector_create|. 
When vector $v$ is shorter than the residual history, 
it stores the residual history in order to vector $v$.

\subsubsection{lis\_esolver\_get\_evalues}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_evalues(LIS_ESOLVER esolver, LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_esolver_get_evalues(LIS_ESOLVER esolver,|\\
\verb|         LIS_VECTOR v, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get all the eigenvalues from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v]  The vector which stores the eigenvalues
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Vector $v$ must be created in advance with the function \verb|lis_vector_create|. 

\newpage
\subsubsection{lis\_esolver\_get\_evectors}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_evectors(LIS_ESOLVER esolver, LIS_MATRIX M)|\\
\verb|Fortran subroutine lis_esolver_get_evectors(LIS_ESOLVER esolver,|\\
\verb|         LIS_MATRIX M, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get all the eigenvectors from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt M]  The matrix in the COO format which stores the eigenvectors
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Matrix $M$ must be created in advance with the function \verb|lis_matrix_create|. The $i$-th eigenvector is stored on the $i$-th column of the matrix $M$. See {\tt lis-(\$VERSION)/test/etest5.c}.

\subsubsection{lis\_esolver\_get\_residualnorms}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_residualnorms(LIS_ESOLVER esolver, LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_esolver_get_residualnorms(LIS_ESOLVER esolver,|\\
\verb|         LIS_VECTOR v, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the relative residual norms $||\lambda x-(B^{-1})Ax||_2/||\lambda x||_2$ of all the eigenpairs from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v]  The vector which stores the residual norms
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Vector $v$ must be created in advance with the function \verb|lis_vector_create|. 

\newpage
\subsubsection{lis\_esolver\_get\_iters}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_iters(LIS_ESOLVER esolver, LIS_VECTOR v)|\\
\verb|Fortran subroutine lis_esolver_get_iter(LIS_ESOLVER esolver, |\\
\verb|         LIS_VECTOR v, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the numbers of iterations of all the eigenpairs from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v]  The vector which stores the numbers of iterations
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
Vector $v$ must be created in advance with the function \verb|lis_vector_create|. 

\subsubsection{lis\_esolver\_get\_esolver}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_esolver(LIS_ESOLVER esolver, LIS_INT *nesol)|\\
\verb|Fortran subroutine lis_esolver_get_esolver(LIS_ESOLVER esolver,|\\
\verb|         LIS_INTEGER nesol, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the eigensolver number from the eigensolver.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt esolver] The eigensolver
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nesol] The eigensolver number
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_esolver\_get\_esolvername}
\begin{screen}
\verb|C       LIS_INT lis_esolver_get_esolvername(LIS_INT nesol, char *ename)|\\
\verb|Fortran subroutine lis_esolver_get_esolvername(LIS_INTEGER nesol, character ename,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the eigensolver name from the eigensolver number.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt nesol] The eigensolver number
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ename] The eigensolver name
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsection{Computing with Arrays}
The following functions, which are not parallelized, are for local processing.
Array data are stored in column-major order. Array indexing is zero-origin.
See {\tt lis-(\$VERSION)/test/test6.c} and \\
{\tt lis-(\$VERSION)/test/test6f.F90}. 

\subsubsection{lis\_array\_swap}
\begin{screen}
\verb|C       LIS_INT lis_array_swap(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR y[])|\\
\verb|Fortran subroutine lis_array_swap(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR y(),|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Swap the values of the vector elements.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors
\item[\tt x, y] The source arrays that store vectors $x, y$ of size $n$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x, y] The destination arrays
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_copy}
\begin{screen}
\verb|C       LIS_INT lis_array_copy(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR y[])|\\
\verb|Fortran subroutine lis_array_copy(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR y(),|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Copy the values of the vector elements.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors  
\item[\tt x] The source array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] The destination array
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_axpy}
\begin{screen}
  \verb|C       LIS_INT lis_array_axpy(LIS_INT n, LIS_SCALAR alpha, LIS_SCALAR x[],|\\
\verb|         LIS_SCALAR y[])|\\
\verb|Fortran subroutine lis_array_axpy(LIS_INTEGER n, LIS_SCALAR alpha, LIS_SCALAR x(),|\\
\verb|         LIS_SCALAR y(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the vectors $y = \alpha x + y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors  
\item[\tt alpha] The scalar value
\item[\tt x, y] The arrays that store vectors $x, y$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $\alpha x + y$ (vector $y$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_xpay}
\begin{screen}
\verb|C       LIS_INT lis_array_xpay(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR alpha,|\\
\verb|         LIS_SCALAR y[])|\\
\verb|Fortran subroutine lis_array_xpay(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR alpha,|\\
\verb|         LIS_SCALAR y(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the vectors $y = x + \alpha y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors  
\item[\tt alpha] The scalar value
\item[\tt x, y] The arrays that store vectors $x, y$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $x + \alpha y$ (vector $y$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_axpyz}
\begin{screen}
\verb|C       LIS_INT lis_array_axpyz(LIS_INT n, LIS_SCALAR alpha, LIS_SCALAR x[],|\\
\verb|         LIS_SCALAR y[], LIS_SCALAR z[])|\\
\verb|Fortran subroutine lis_array_axpyz(LIS_INTEGER n, LIS_SCALAR alpha, LIS_SCALAR x(),|\\
\verb|         LIS_SCALAR y(), LIS_SCALAR z(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the vectors $z = \alpha x + y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors
\item[\tt alpha] The scalar value
\item[\tt x, y] The arrays that store vectors $x, y$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt z] $\alpha x + y$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_scale}
\begin{screen}
\verb|C       LIS_INT lis_array_scale(LIS_INT n, LIS_SCALAR alpha, LIS_SCALAR x[])|
\verb|Fortran subroutine lis_array_scale(LIS_INTEGER n, LIS_SCALAR alpha, LIS_SCALAR x(),|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Multiply vector $x$ by scalar $\alpha$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector  
\item[\tt alpha] The scalar value
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] $\alpha x$ (vector $x$ is overwritten)
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_pmul}
\begin{screen}
\verb|C       LIS_INT lis_array_pmul(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR y[],|\\
\verb|         LIS_SCALAR z[])|\\
\verb|Fortran subroutine lis_array_pmul(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR y(),|\\
\verb|         LIS_SCALAR z(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Multiply each element of vector $x$ by the corresponding element of $y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors  
\item[\tt x, y] The arrays that store vectors $x, y$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt z] The array that stores the multiplied elements of $x$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_pdiv}
\begin{screen}
\verb|C       LIS_INT lis_array_pdiv(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR y[],|\\
\verb|         LIS_SCALAR z[])|\\
\verb|Fortran subroutine lis_array_pdiv(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR y(),|\\
\verb|         LIS_SCALAR z(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Divide each element of vector $x$ by the corresponding element of $y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors  
\item[\tt x, y] The arrays that store vectors $x, y$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt z] The array that stores the divided elements of $x$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_set\_all}
\begin{screen}
\verb|C       LIS_INT lis_array_set_all(LIS_INT n, LIS_SCALAR value, LIS_SCALAR x[])|
\verb|Fortran subroutine lis_array_set_all(LIS_INTEGER n, LIS_SCALAR value,|\\
\verb|         LIS_SCALAR x(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Assign the scalar value to the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt value] The scalar value to be assigned
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The array with the value assigned to the elements
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_abs}
\begin{screen}
\verb|C       LIS_INT lis_array_abs(LIS_INT n, LIS_SCALAR x[])|\\
\verb|Fortran subroutine lis_array_abs(LIS_INTEGER n, LIS_SCALAR x(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the absolute values of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The array that stores the absolute values
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_reciprocal}
\begin{screen}
\verb|C       LIS_INT lis_array_reciprocal(LIS_INT n, LIS_SCALAR x[])|\\
\verb|Fortran subroutine lis_array_reciprocal(LIS_INTEGER n, LIS_SCALAR x(),|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the reciprocal values of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The array that stores the reciprocal values
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_conjugate}
\begin{screen}
\verb|C       LIS_INT lis_array_conjugate(LIS_INT n, LIS_SCALAR x[])|\\
\verb|Fortran subroutine lis_array_conjugate(LIS_INTEGER n, LIS_SCALAR x(),|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Get the conjugate values of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The array that stores the conjugate values
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_shift}
\begin{screen}
\verb|C       LIS_INT lis_array_shift(LIS_INT n, LIS_SCALAR sigma, LIS_SCALAR x[])|\\
\verb|Fortran subroutine lis_array_shift(LIS_INTEGER n, LIS_SCALAR sigma, LIS_SCALAR x(),|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Shift vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt sigma] The amount of the shift
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The array that stores the shifted elements $x_i-\sigma$ 
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_dot}
\begin{screen}
\verb|C       LIS_INT lis_array_dot(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR y[],|\\
\verb|         LIS_SCALAR *value)|\\
\verb|Fortran subroutine lis_array_dot(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR y(),|\\
\verb|         LIS_SCALAR value, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the Hermitian inner product $x^{H}y$ of vectors $x, y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors  
\item[\tt x, y] The arrays that store vectors $x, y$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The Hermitian inner product
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_nhdot}
\begin{screen}
\verb|C       LIS_INT lis_array_nhdot(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR y[],|\\
\verb|         LIS_SCALAR *value)|\\
\verb|Fortran subroutine lis_array_nhdot(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR y(),|\\
\verb|         LIS_SCALAR value, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the non-Hermitian inner product $x^{T}y$ of vectors $x, y$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vectors  
\item[\tt x, y] The arrays that store vectors $x, y$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The non-Hermitian inner product
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_nrm1}
\begin{screen}
\verb|C       LIS_INT lis_array_nrm1(LIS_INT n, LIS_SCALAR x[], LIS_REAL *value)|\\
\verb|Fortran subroutine lis_array_nrm1(LIS_INTEGER n, LIS_SCALAR x(), LIS_REAL value,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the 1-norm of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The 1-norm of the vector
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_nrm2}
\begin{screen}
\verb|C       LIS_INT lis_array_nrm2(LIS_INT n, LIS_SCALAR x[], LIS_REAL *value)|\\
\verb|Fortran subroutine lis_array_nrm2(LIS_INTEGER n, LIS_SCALAR x(), LIS_REAL value,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the 2-norm of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The 2-norm of the vector
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_nrmi}
\begin{screen}
\verb|C       LIS_INT lis_array_nrmi(LIS_INT n, LIS_SCALAR x[], LIS_REAL *value)|\\
\verb|Fortran subroutine lis_array_nrmi(LIS_INTEGER n, LIS_SCALAR x(), LIS_REAL value,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the infinity norm of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The infinity norm of the vector
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_sum}
\begin{screen}
\verb|C       LIS_INT lis_array_sum(LIS_INT n, LIS_SCALAR x[], LIS_SCALAR *value)|\\
\verb|Fortran subroutine lis_array_sum(LIS_INTEGER n, LIS_SCALAR x(), LIS_SCALAR value,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the sum of the elements of vector $x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the vector
\item[\tt x] The array that stores vector $x$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt value] The sum of the vector elements 
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_matvec}
\begin{screen}
\verb|C       LIS_INT lis_array_matvec(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR x[],|\\
\verb|         LIS_SCALAR y[], LIS_INT op)|\\
\verb|Fortran subroutine lis_array_matvec(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR x(),|\\
\verb|         LIS_SCALAR y(), LIS_INTEGER op, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the matrix-vector product $Ax$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrix and vectors  
\item[\tt a] The array that stores matrix $A$ of size $n \times n$
\item[\tt x] The array that stores vector $x$ of size $n$
\item[\tt y] The array that stores vector $y$ of size $n$
\item[\tt op] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $y = Ax$
\item[\tt LIS\_SUB\_VALUE]: $y = y - Ax$
\end{description}
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $y$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_matvech}
\begin{screen}
\verb|C       LIS_INT lis_array_matvech(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR x[],|\\
\verb|         LIS_SCALAR y[], LIS_INT op)|\\
\verb|Fortran subroutine lis_array_matvech(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR x(),|\\
\verb|         LIS_SCALAR y(), LIS_INTEGER op, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the matrix-vector product $A^{H}x$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrix and vectors  
\item[\tt a] The array that stores matrix $A$ of size $n \times n$
\item[\tt x] The array that stores vector $x$ of size $n$
\item[\tt y] The array that stores vector $y$ of size $n$
\item[\tt op] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $y = A^Hx$
\item[\tt LIS\_SUB\_VALUE]: $y = y - A^Hx$
\end{description}
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $y$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_matvec\_ns}
\begin{screen}
\verb|C       LIS_INTEGER lis_array_matvec_ns(LIS_INT m, LIS_INT n, LIS_SCALAR a[],|\\
\verb|         LIS_INT lda, LIS_SCALAR x[], LIS_SCALAR y[], LIS_INT op)|\\
\verb|Fortran subroutine lis_array_matvec_ns(LIS_INTEGER m, LIS_INTEGER n, LIS_SCALAR a()|\\
\verb|         LIS_INTEGER lda, LIS_SCALAR x(), LIS_SCALAR y(), LIS_INTEGER op,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the matrix-vector product $Ax$, where matrix $A$ is not square.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt m, n] The sizes of the matrix and vectors  
\item[\tt a] The array that stores matrix $A$ of size $m \times n$
\item[\tt lda] The size of the leading dimension of array $A$
\item[\tt x] The array that stores vector $x$ of size $n$
\item[\tt y] The array that stores vector $y$ of size $m$
\item[\tt op] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $y = Ax$
\item[\tt LIS\_SUB\_VALUE]: $y = y - Ax$
\end{description}
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt y] $y$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_matmat}
\begin{screen}
\verb|C       LIS_INT lis_array_matmat(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR b[],|\\
\verb|         LIS_SCALAR c[], LIS_INT op)|\\
\verb|Fortran subroutine lis_array_matmat(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR b(),|\\
\verb|         LIS_SCALAR c(), LIS_INTEGER op, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the matrix-matrix product $AB$.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrices
\item[\tt a] The array that stores matrix $A$ of size $n \times n$
\item[\tt b] The array that stores matrix $B$ of size $n \times n$
\item[\tt c] The array that stores matrix $C$ of size $n \times n$
\item[\tt op] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $C = AB$
\item[\tt LIS\_SUB\_VALUE]: $C = C - AB$
\end{description}
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt c] $C$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_matmat\_ns}
\begin{screen}
\verb|C       LIS_INT lis_array_matmat_ns(LIS_INT l, LIS_INT m, LIS_INT n,|\\
\verb|         LIS_SCALAR a[], LIS_INT lda, LIS_SCALAR b[], LIS_INT ldb, LIS_SCALAR c[],|\\
\verb|         LIS_INT ldc, LIS_INT op)|\\
\verb|Fortran subroutine lis_array_matmat_ns(LIS_INTEGER l, LIS_INTEGER m, LIS_INTEGER n,|\\
\verb|         LIS_SCALAR a(), LIS_INTEGER lda, LIS_SCALAR b(), LIS_INTEGER ldb,|\\
\verb|         LIS_SCALAR c(), LIS_INTEGER ldc, LIS_INTEGER op, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the matrix-matrix product $AB$, where matrices $A, B$ are not square.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt m, n] The sizes of the matrices
\item[\tt a] The array that stores matrix $A$ of size $l \times m$
\item[\tt lda] The size of the leading dimension of array $A$
\item[\tt b] The array that stores matrix $B$ of size $m \times n$
\item[\tt ldb] The size of the leading dimension of array $B$
\item[\tt c] The array that stores matrix $C$ of size $l \times n$
\item[\tt ldc] The size of the leading dimension of array $C$  
\item[\tt op] \begin{description}
\item[\tt LIS\_INS\_VALUE]: $C = AB$
\item[\tt LIS\_SUB\_VALUE]: $C = C - AB$
\end{description}
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt c] $C$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_ge}
\begin{screen}
\verb|C       LIS_INT lis_array_ge(LIS_INT n, LIS_SCALAR a[])|\\
\verb|Fortran subroutine lis_solve(LIS_INTEGER n, LIS_SCALAR a(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the inverse of matrix $A$ with the Gaussian elimination.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrix
\item[\tt a] The array that stores matrix $A$ of size $n \times n$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt a] The inverse $A^{-1}$
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_solve}
\begin{screen}
\verb|C       LIS_INT lis_array_solve(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR b[],|\\
\verb|         LIS_SCALAR x[], LIS_SCALAR w[])|\\
\verb|Fortran subroutine lis_array_solve(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR b(),|\\
\verb|         LIS_SCALAR x(), LIS_SCALAR w(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Solve the linear equation $Ax = b$ with the direct method.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrix
\item[\tt a] The array that stores coefficient matrix $A$ of size $n \times n$
\item[\tt b] The array that stores right-hand side vector $b$ of size $n$
\item[\tt w] The work array of size $n \times n$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt x] The array that stores solution $x$
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_cgs}
\begin{screen}
\verb|C       LIS_INT lis_array_cgs(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR q[],|\\
\verb|         LIS_SCALAR r[])|\\
\verb|Fortran subroutine lis_array_cgs(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR q(),|\\
\verb|         LIS_SCALAR r(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the QR factorization $QR=A$ with the classical Gram-Schmidt process.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrices
\item[\tt a] The array that stores matrix $A$ of size $n \times n$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt q] The array that stores orthogonal matrix $Q$ of size $n \times n$
\item[\tt r] The array that stores upper-triangular matrix $R$ of size $n \times n$  
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_array\_mgs}
\begin{screen}
\verb|C       LIS_INT lis_array_mgs(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR q[],|\\
\verb|         LIS_SCALAR r[])|\\
\verb|Fortran subroutine lis_array_mgs(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR q(),|\\
\verb|         LIS_SCALAR r(), LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the QR factorization $QR=A$ with the modified Gram-Schmidt process.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrices
\item[\tt a] The array that stores matrix $A$ of size $n \times n$
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt q] The array that stores orthogonal matrix $Q$ of size $n \times n$
\item[\tt r] The array that stores upper-triangular matrix $R$ of size $n \times n$  
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_array\_qr}
\begin{screen}
\verb|C       LIS_INT lis_array_qr(LIS_INT n, LIS_SCALAR a[], LIS_SCALAR q[],|\\
\verb|         LIS_SCALAR r[], LIS_INT *qriter, LIS_REAL *qrerr)|\\
\verb|Fortran subroutine lis_array_qr(LIS_INTEGER n, LIS_SCALAR a(), LIS_SCALAR q(),|\\
\verb|         LIS_SCALAR r(), LIS_INTEGER qriter, LIS_REAL qrerr, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Calculate the eigenvalues of matrix $A$ with the QR algorithm.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt n] The size of the matrices
\item[\tt a] The array that stores symmetric matrix $A$ of size $n \times n$
\item[\tt q] The work array of size $n \times n$
\item[\tt r] The work array of size $n \times n$  
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt a] The array that stores the block upper-triangular matrix with eigenvalues in the block diagonal elements after similarity transformation
\item[\tt qriter] The number of iterations of the QR algorithm
\item[\tt qrerr] The 2-norm of the first subdiagonal element $A(2,1)$ after similarity transformation
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsection{Operating External Files}
\subsubsection{lis\_input}
\begin{screen}
\verb|C       LIS_INT lis_input(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x, char *filename)|
\verb|Fortran subroutine lis_input(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
\verb|         character filename, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Read the matrix and vector data from the external file. 
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt filename] The source file
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix in the specified storage format
\item[\tt b] The right-hand side vector
\item[\tt x] The solution
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The following file formats are supported:
\begin{itemize}
\item The extended Matrix Market format (extended to allow vector data)
\item The Harwell-Boeing format
\end{itemize}

\subsubsection{lis\_input\_vector}
\begin{screen}
\verb|C       LIS_INT lis_input_vector(LIS_VECTOR v, char *filename)|\\
\verb|Fortran subroutine lis_input_vector(LIS_VECTOR v, character filename,|\\
\verb|         LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Read the vector data from the external file.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt filename] The source file
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The following file formats are supported:
\begin{itemize}
\item The PLAIN format
\item The extended Matrix Market format (extended to allow vector data)
\end{itemize}

\subsubsection{lis\_input\_matrix}
\begin{screen}
\verb|C       LIS_INT lis_input_matrix(LIS_MATRIX A, char *filename)|\\
\verb|Fortran subroutine lis_input_matrix(LIS_MATRIX A, character filename,|\\
\verb|         LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Read the matrix data from the external file.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt filename] The source file
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix in the specified storage format
\item[\tt x] The solution
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
The following file formats are supported:
\begin{itemize}
\item The Matrix Market format
\item The Harwell-Boeing format
\end{itemize}

\subsubsection{lis\_output}
\begin{screen}
\verb|C       LIS_INT lis_output(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
\verb|         LIS_INT format, char *filename)|\\
\verb|Fortran subroutine lis_output(LIS_MATRIX A, LIS_VECTOR b, LIS_VECTOR x,|\\
\verb|         LIS_INTEGER format, character filename, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Write the matrix and vector data into the external file.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt b] The right-hand side vector 
\item[\tt x] The solution 
\item[\tt format] The file format
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt LIS\_FMT\_MM] The Matrix Market format
\end{namelist}
\item[\tt filename] The destination file
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}
{\bf Note}\\
\indent
In the C version, {\tt NULL} can be input if the vector should not be written to the external file.

\subsubsection{lis\_output\_vector}
\begin{screen}
\verb|C       LIS_INT lis_output_vector(LIS_VECTOR v, LIS_INT format, char *filename)|
\verb|Fortran subroutine lis_output_vector(LIS_VECTOR v, LIS_INTEGER format,|\\
\verb|         character filename, LIS_INTEGER ierr) |
\end{screen}
{\bf Description}\\
\indent
Write the vector data into the external file.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt v] The vector
\item[\tt format] The file format
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt LIS\_FMT\_PLAIN] The PLAIN format
\item[\tt LIS\_FMT\_MM] The Matrix Market format
\end{namelist}
\item[\tt filename] The destination file
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_output\_matrix}
\begin{screen}
\verb|C       LIS_INT lis_output_matrix(LIS_MATRIX A, LIS_INT format, char *filename)|\\
\verb|Fortran subroutine lis_output_matrix(LIS_MATRIX A, LIS_INTEGER format,|\\
\verb|         character filename, LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Write the matrix data into the external file.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt A] The matrix
\item[\tt format] The file format
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt LIS\_FMT\_MM] The Matrix Market format
\end{namelist}
\item[\tt filename] The destination file
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsection{Other Functions}
\subsubsection{lis\_initialize}
\begin{screen}
\verb|C       LIS_INT lis_initialize(LIS_INT* argc, char** argv[])|\\
\verb|Fortran subroutine lis_initialize(LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Initialize the execution environment.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt argc] The number of command line arguments
\item[\tt argv] The command line argument
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\subsubsection{lis\_finalize}
\begin{screen}
\verb|C       LIS_INT lis_finalize()|\\
\verb|Fortran subroutine lis_finalize(LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Finalize the execution environment.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None] 
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}

\newpage
\subsubsection{lis\_wtime}
\begin{screen}
\verb|C       double lis_wtime()|\\
\verb|Fortran function lis_wtime()|
\end{screen}
{\bf Description}\\
\indent
Measure the elapsed time. 
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None]
\end{namelist}
{\bf Output}\\
\indent
The elapsed time in seconds from the given point is returned as the
double precision number.
\\ \\
\noindent
{\bf Note}\\
\indent
To measure the processing time, call \verb|lis_wtime| to get
the starting time, call it again to get the ending time, 
and calculate the difference. 

\subsubsection{CHKERR}
\begin{screen}
\verb|C       void CHKERR(LIS_INT ierr)|\\
\verb|Fortran subroutine CHKERR(LIS_INTEGER ierr)|
\end{screen}
{\bf Description}\\
\indent
Check the value of the return code. 
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt ierr] The return code
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[None] 
\end{namelist}
\noindent
{\bf Note}\\
\indent
If the value of the return code is not 0, it calls \verb|lis_finalize| 
and terminates the program. 

\newpage
\subsubsection{lis\_printf}
\begin{screen}
\verb|C       LIS_INT lis_printf(LIS_Comm comm, const char *mess, ...)|
\end{screen}
{\bf Description}\\
\indent
Print message on processing element 0.
\\ \\
\noindent
{\bf Input}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt comm] The MPI communicator
\end{namelist}
{\bf Output}
\begin{namelist}{XXXXXXXXXXXXXXXXXXXX}
\item[\tt mess] The message
\end{namelist}
{\bf Note}\\
\indent
The string '\%D' is replaced with '\%lld' if LIS\_INT is long long int, and is replaced with '\%d' if it is int.

For the serial and multithreaded environments, the value of {\tt comm} is ignored. 

\newpage
\addcontentsline{toc}{section}{References}
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\newpage
\appendix
\section{File Formats}
\label{sec:matinp}
This section describes the file formats available for the library.
Note that both the upper and lower triangular entries need to be stored
irrespective of whether the matrix is symmetric or not in the
Harwell-Boeing Format. 

\subsection{Extended Matrix Market Format}
The Matrix Market format does not support 
the vector data. The extended Matrix Market format is the extension of
the Matrix Market format to handle 
the matrix and vector data. Assume that the number of nonzero elements of
matrix $A=(a_{ij})$ of size $M$ $\times$ $N$ is $L$ and 
that $a_{ij} = A(I,J)$. The format is as follows: 

{\small
\begin{verbatim}
%%MatrixMarket matrix coordinate real general  <-- Header
%                                              <-+ 
%                                                | Comment lines with 0 or more lines
%                                              <-+
M N L B X                                      <-- Numbers of rows, columns, and 
I1 J1 A(I1,J1)                                 <-+    nonzero elements (0 or 1) (0 or 1)
I2 J2 A(I2,J2)                                   | Row and column number values
 . . .                                           | The index is one-origin
IL JL A(IL,JL)                                 <-+
I1 B(I1)                                       <-+
I2 B(I2)                                         | Right-hand side vector (exists only when B=1)
 . . .                                           | Row number value
IM B(IM)                                       <-+
I1 X(I1)                                       <-+
I2 X(I2)                                         | Solution (exists only when X=1)
 . . .                                           | Row number value
IM X(IM)                                       <-+
\end{verbatim}
}

The extended Matrix Market format for matrix $A$ and vector $b$ in Equation (\ref{eq:matavecv}) is as follows: 
\begin{equation}
A = 
\left(
\begin{array}{cccc}
2 & 1 &   &    \\
1 & 2 & 1 &    \\ 
  & 1 & 2 & 1 \\
  &   & 1 & 2 
\end{array}
\right), 
~~~~~~~~~~~~
b = 
\left(
\begin{array}{c}
0 \\
1 \\ 
2 \\
3  
\end{array}
\right)
\label{eq:matavecv}
\end{equation}

{\small
\begin{verbatim}
%%MatrixMarket matrix coordinate real general
4 4 10 1 0
1 2  1.00e+00
1 1  2.00e+00
2 3  1.00e+00
2 1  1.00e+00
2 2  2.00e+00
3 4  1.00e+00
3 2  1.00e+00
3 3  2.00e+00
4 4  2.00e+00
4 3  1.00e+00
1  0.00e+00
2  1.00e+00
3  2.00e+00
4  3.00e+00
\end{verbatim}
}

\subsection{Harwell-Boeing Format}
The Harwell-Boeing format stores the matrix in the CSC format.
Assume that the array {\tt value} stores the values of the nonzero elements of matrix $A$, 
the array {\tt index} stores the row indices of the nonzero elements and 
the array {\tt ptr} stores pointers to the top of each column in the
arrays {\tt value} and {\tt index}. The format is as follows: 

{\small
\begin{verbatim}
Line 1 (A72,A8)
   1 - 72 Title
  73 - 80 Key
Line 2 (5I14)
   1 - 14 Total number of lines excluding header 
  15 - 28 Number of lines for ptr
  29 - 42 Number of lines for index
  43 - 56 Number of lines for value
  57 - 70 Number of lines for right-hand side vectors
Line 3 (A3,11X,4I14)
   1 -  3 Matrix type 
            Col.1: 
              R Real matrix
              C Complex matrix
              P Pattern only (Not supported)
            Col.2: 
              S Symmetric (Not supported)
              U Unsymmetric
              H Hermitian (Not supported)
              Z Skew symmetric (Not supported)
              R Rectangular (Not supported)
            Col.3: 
              A Assembled
              E Elemental matrices (Not supported)
   4 - 14 Blank space
  15 - 28 Number of rows
  29 - 42 Number of columns 
  43 - 56 Number of nonzero elements
  57 - 70 0
Line 4 (2A16,2A20)
   1 - 16 Format for ptr
  17 - 32 Format for index
  33 - 52 Format for value
  53 - 72 Format for right-hand side vectors
Line 5 (A3,11X,2I14) Only presents if there are right-hand side vectors
   1      right-hand side vector type
            F for full storage
            M for same format as matrix (Not supported)
   2      G if a starting vector is supplied
   3      X if an exact solution is supplied
   4 - 14 Blank space
  15 - 28 Number of right-hand side vectors 
  29 - 42 Number of nonzero elements
\end{verbatim}
}

The Harwell-Boeing format for matrix $A$ and vector $b$ in Equation (\ref{eq:matavecv}) is as follows: 

{\small
\begin{verbatim}
1--------10--------20--------30--------40--------50--------60--------70--------80
Harwell-Boeing format sample                                            Lis
             8             1             1             4             2
RUA                        4             4            10             4
(11i7)          (13i6)          (3e26.18)           (3e26.18)
F                          1             0
      1      3      6      9
     1     2     1     2     3     2     3     4     3     4
  2.000000000000000000E+00  1.000000000000000000E+00  1.000000000000000000E+00
  2.000000000000000000E+00  1.000000000000000000E+00  1.000000000000000000E+00
  2.000000000000000000E+00  1.000000000000000000E+00  1.000000000000000000E+00
  2.000000000000000000E+00
  0.000000000000000000E+00  1.000000000000000000E+00  2.000000000000000000E+00
  3.000000000000000000E+00
\end{verbatim}
}

\subsection{Extended Matrix Market Format for Vectors}
The extended Matrix Market format for vectors is 
the extension of the Matrix Market format to handle the vector data. 
Assume that vector $b=(b_{i})$ is a vector of size 
$N$ and that $b_{i} = B(I)$. The format is as follows:

{\small
\begin{verbatim}
%%MatrixMarket vector coordinate real general  <--  Header
%                                              <-+ 
%                                                | Comment lines with 0 or more lines
%                                              <-+
N                                              <-- Number of rows
I1 B(I1)                                       <-+
I2 B(I2)                                         | Row number value
 . . .                                           | The index is one-origin
IN B(IN)                                       <-+ 
\end{verbatim}
}

The extended Matrix Market format for vector $b$ in Equation (\ref{eq:matavecv}) is as follows:

{\small
\begin{verbatim}
%%MatrixMarket vector coordinate real general
4
1  0.00e+00
2  1.00e+00
3  2.00e+00
4  3.00e+00
\end{verbatim}
}

\subsection{PLAIN Format for Vectors}
The PLAIN format for vectors is designed to write vector values in
order. Assume that vector $b=(b_{i})$ is a vector of size $N$ and
that $b_{i}$ is equal to $B(I)$. The format is as follows:

{\small
\begin{verbatim}
B(1)                                       <-+
B(2)                                         | Vector value
. . .                                        | 
B(N)                                       <-+ 
\end{verbatim}
}

The PLAIN format for vector $b$ in Equation (\ref{eq:matavecv}) is as follows: 

{\small
\begin{verbatim}
0.00e+00
1.00e+00
2.00e+00
3.00e+00
\end{verbatim}
}
\end{document}



