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//------------------------------------------------------------------------------
// CHOLMOD/MATLAB/mwrite: write a matrix in Matrix Market format
//------------------------------------------------------------------------------
// CHOLMOD/MATLAB Module. Copyright (C) 2005-2023, Timothy A. Davis.
// All Rights Reserved.
// SPDX-License-Identifier: GPL-2.0+
//------------------------------------------------------------------------------
// Write a matrix to a file in Matrix Market form.
//
// symmetry = mwrite (filename, A, Z, comments_filename)
//
// A can be sparse or full.
//
// If present and non-empty, A and Z must have the same dimension. Z contains
// the explicit zero entries in the matrix (which MATLAB drops). The entries
// of Z appear as explicit zeros in the output file. Z is optional. If it is
// an empty matrix it is ignored. Z must be sparse or empty, if present.
// It is ignored if A is full.
//
// filename is the name of the output file. comments_file is file whose
// contents are include after the Matrix Market header and before the first
// data line. Ignored if an empty string or not present.
#include "sputil2.h"
#define MAXLEN 1030
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
double dummy = 0 ;
cholmod_sparse Amatrix, Zmatrix, *A, *Z ;
cholmod_dense Xmatrix, *X ;
cholmod_common Common, *cm ;
int64_t arg_z, arg_comments, sym ;
char filename [MAXLEN], comments [MAXLEN] ;
//--------------------------------------------------------------------------
// start CHOLMOD and set parameters
//--------------------------------------------------------------------------
cm = &Common ;
cholmod_l_start (cm) ;
sputil2_config (SPUMONI, cm) ;
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
if (nargin < 2 || nargin > 4 || nargout > 1)
{
mexErrMsgTxt ("Usage: mwrite (filename, A, Z, comments_filename)") ;
}
//--------------------------------------------------------------------------
// get the output filename
//--------------------------------------------------------------------------
if (!mxIsChar (pargin [0]))
{
mexErrMsgTxt ("first parameter must be a filename") ;
}
mxGetString (pargin [0], filename, MAXLEN) ;
//--------------------------------------------------------------------------
// get the A matrix (sparse or dense)
//--------------------------------------------------------------------------
size_t A_xsize = 0 ;
size_t X_xsize = 0 ;
if (mxIsSparse (pargin [1]))
{
A = sputil2_get_sparse (pargin [1], 0, CHOLMOD_DOUBLE, &Amatrix,
&A_xsize, cm) ;
X = NULL ;
}
else
{
X = sputil2_get_dense (pargin [1], CHOLMOD_DOUBLE, &Xmatrix,
&X_xsize, cm) ;
A = NULL ;
}
//--------------------------------------------------------------------------
// determine if the Z matrix and comments_file are present
//--------------------------------------------------------------------------
if (nargin == 3)
{
if (mxIsChar (pargin [2]))
{
// mwrite (file, A, comments)
arg_z = -1 ;
arg_comments = 2 ;
}
else
{
// mwrite (file, A, Z). Ignore Z if A is full
arg_z = (A == NULL) ? -1 : 2 ;
arg_comments = -1 ;
}
}
else if (nargin == 4)
{
// mwrite (file, A, Z, comments). Ignore Z is A is full
arg_z = (A == NULL) ? -1 : 2 ;
arg_comments = 3 ;
}
else
{
arg_z = -1 ;
arg_comments = -1 ;
}
//--------------------------------------------------------------------------
// get the Z matrix
//--------------------------------------------------------------------------
size_t Z_xsize = 0 ;
if (arg_z == -1 ||
mxGetM (pargin [arg_z]) == 0 || mxGetN (pargin [arg_z]) == 0)
{
// A is dense, Z is not present, or Z is empty. Ignore Z.
Z = NULL ;
}
else
{
// A is sparse and Z is present and not empty
if (!mxIsSparse (pargin [arg_z]))
{
mexErrMsgTxt ("Z must be sparse") ;
}
Z = sputil2_get_sparse (pargin [arg_z], 0, CHOLMOD_DOUBLE, &Zmatrix,
&Z_xsize, cm) ;
}
//--------------------------------------------------------------------------
// get the comments filename
//--------------------------------------------------------------------------
comments [0] = '\0' ;
if (arg_comments != -1)
{
if (!mxIsChar (pargin [arg_comments]))
{
mexErrMsgTxt ("comments filename must be a string") ;
}
mxGetString (pargin [arg_comments], comments, MAXLEN) ;
}
//--------------------------------------------------------------------------
// write the matrix to the file
//--------------------------------------------------------------------------
sputil2_file = fopen (filename, "w") ;
if (sputil2_file == NULL)
{
mexErrMsgTxt ("error opening file") ;
}
if (A != NULL)
{
sym = cholmod_l_write_sparse (sputil2_file, A, Z, comments, cm) ;
}
else
{
sym = cholmod_l_write_dense (sputil2_file, X, comments, cm) ;
}
fclose (sputil2_file) ;
sputil2_file = NULL ;
if (sym < 0)
{
mexErrMsgTxt ("mwrite failed") ;
}
//--------------------------------------------------------------------------
// free workspace and return symmetry
//--------------------------------------------------------------------------
sputil2_free_sparse (&A, &Amatrix, A_xsize, cm) ;
sputil2_free_sparse (&Z, &Zmatrix, Z_xsize, cm) ;
sputil2_free_dense (&X, &Xmatrix, X_xsize, cm) ;
pargout [0] = sputil2_put_int (&sym, 1, 0) ;
cholmod_l_finish (cm) ;
if (SPUMONI > 0) cholmod_l_print_common (" ", cm) ;
}
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