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/* ========================================================================== */
/* === CHOLMOD/MATLAB/mread mexFunction ===================================== */
/* ========================================================================== */
/* -----------------------------------------------------------------------------
* CHOLMOD/MATLAB Module. Copyright (C) 2005-2006, Timothy A. Davis
* http://www.suitesparse.com
* MATLAB(tm) is a Trademark of The MathWorks, Inc.
* -------------------------------------------------------------------------- */
/* [A Z] = mread (filename, prefer_binary)
*
* Read a sparse or dense matrix from a file in Matrix Market format.
*
* All MatrixMarket formats are supported.
* The Matrix Market "integer" format is converted into real, but the values
* are preserved. The "pattern" format is converted into real. If a pattern
* matrix is unsymmetric, all of its values are equal to one. If a pattern is
* symmetric, the kth diagonal entry is set to one plus the number of
* off-diagonal nonzeros in row/column k, and off-diagonal entries are set to
* -1.
*
* Explicit zero entries are returned as the binary pattern of the matrix Z.
*/
#include "cholmod_matlab.h"
/* maximum file length */
#define MAXLEN 1030
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
void *G ;
cholmod_dense *X = NULL ;
cholmod_sparse *A = NULL, *Z = NULL ;
cholmod_common Common, *cm ;
Long *Ap = NULL, *Ai ;
double *Ax, *Az = NULL ;
char filename [MAXLEN] ;
Long nz, k, is_complex = FALSE, nrow = 0, ncol = 0, allzero ;
int mtype ;
/* ---------------------------------------------------------------------- */
/* start CHOLMOD and set parameters */
/* ---------------------------------------------------------------------- */
cm = &Common ;
cholmod_l_start (cm) ;
sputil_config (SPUMONI, cm) ;
/* ---------------------------------------------------------------------- */
/* get inputs */
/* ---------------------------------------------------------------------- */
if (nargin < 1 || nargin > 2 || nargout > 2)
{
mexErrMsgTxt ("usage: [A Z] = mread (filename, prefer_binary)") ;
}
if (!mxIsChar (pargin [0]))
{
mexErrMsgTxt ("mread requires a filename") ;
}
mxGetString (pargin [0], filename, MAXLEN) ;
sputil_file = fopen (filename, "r") ;
if (sputil_file == NULL)
{
mexErrMsgTxt ("cannot open file") ;
}
if (nargin > 1)
{
cm->prefer_binary = (mxGetScalar (pargin [1]) != 0) ;
}
/* ---------------------------------------------------------------------- */
/* read the matrix, as either a dense or sparse matrix */
/* ---------------------------------------------------------------------- */
G = cholmod_l_read_matrix (sputil_file, 1, &mtype, cm) ;
fclose (sputil_file) ;
sputil_file = NULL ;
if (G == NULL)
{
mexErrMsgTxt ("could not read file") ;
}
/* get the specific matrix (A or X), and change to ZOMPLEX if needed */
if (mtype == CHOLMOD_SPARSE)
{
A = (cholmod_sparse *) G ;
nrow = A->nrow ;
ncol = A->ncol ;
is_complex = (A->xtype == CHOLMOD_COMPLEX) ;
Ap = A->p ;
Ai = A->i ;
if (is_complex)
{
/* if complex, ensure A is ZOMPLEX */
cholmod_l_sparse_xtype (CHOLMOD_ZOMPLEX, A, cm) ;
}
Ax = A->x ;
Az = A->z ;
}
else if (mtype == CHOLMOD_DENSE)
{
X = (cholmod_dense *) G ;
nrow = X->nrow ;
ncol = X->ncol ;
is_complex = (X->xtype == CHOLMOD_COMPLEX) ;
if (is_complex)
{
/* if complex, ensure X is ZOMPLEX */
cholmod_l_dense_xtype (CHOLMOD_ZOMPLEX, X, cm) ;
}
Ax = X->x ;
Az = X->z ;
}
else
{
mexErrMsgTxt ("invalid file") ;
}
/* ---------------------------------------------------------------------- */
/* if requested, extract the zero entries and place them in Z */
/* ---------------------------------------------------------------------- */
if (nargout > 1)
{
if (mtype == CHOLMOD_SPARSE)
{
/* A is a sparse real/zomplex double matrix */
Z = sputil_extract_zeros (A, cm) ;
}
else
{
/* input is full; just return an empty Z matrix */
Z = cholmod_l_spzeros (nrow, ncol, 0, CHOLMOD_REAL, cm) ;
}
}
/* ---------------------------------------------------------------------- */
/* prune the zero entries from A and set nzmax(A) to nnz(A) */
/* ---------------------------------------------------------------------- */
if (mtype == CHOLMOD_SPARSE)
{
sputil_drop_zeros (A) ;
cholmod_l_reallocate_sparse (cholmod_l_nnz (A, cm), A, cm) ;
}
/* ---------------------------------------------------------------------- */
/* change a complex matrix to real if its imaginary part is all zero */
/* ---------------------------------------------------------------------- */
if (is_complex)
{
if (mtype == CHOLMOD_SPARSE)
{
nz = Ap [ncol] ;
}
else
{
nz = nrow * ncol ;
}
allzero = TRUE ;
for (k = 0 ; k < nz ; k++)
{
if (Az [k] != 0)
{
allzero = FALSE ;
break ;
}
}
if (allzero)
{
/* discard the all-zero imaginary part */
if (mtype == CHOLMOD_SPARSE)
{
cholmod_l_sparse_xtype (CHOLMOD_REAL, A, cm) ;
}
else
{
cholmod_l_dense_xtype (CHOLMOD_REAL, X, cm) ;
}
}
}
/* ---------------------------------------------------------------------- */
/* return results to MATLAB */
/* ---------------------------------------------------------------------- */
if (mtype == CHOLMOD_SPARSE)
{
pargout [0] = sputil_put_sparse (&A, cm) ;
}
else
{
pargout [0] = sputil_put_dense (&X, cm) ;
}
if (nargout > 1)
{
pargout [1] = sputil_put_sparse (&Z, cm) ;
}
/* ---------------------------------------------------------------------- */
/* free workspace */
/* ---------------------------------------------------------------------- */
cholmod_l_finish (cm) ;
cholmod_l_print_common (" ", cm) ;
}
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