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// CXSparse/MATLAB/CSparse/cs_mex: utility functions for MATLAB interface
// CXSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
// SPDX-License-Identifier: LGPL-2.1+
#include "cs_mex.h"
/* check MATLAB input argument */
void cs_mex_check (int64_t nel, int64_t m, int64_t n, int square, int sparse,
int values, const mxArray *A)
{
int64_t nnel, mm = mxGetM (A), nn = mxGetN (A) ;
#ifdef NCOMPLEX
if (values)
{
if (mxIsComplex (A)) mexErrMsgTxt ("complex matrices not supported") ;
}
#endif
if (sparse && !mxIsSparse (A)) mexErrMsgTxt ("matrix must be sparse") ;
if (!sparse)
{
if (mxIsSparse (A)) mexErrMsgTxt ("matrix must be full") ;
if (values && !mxIsDouble (A)) mexErrMsgTxt ("matrix must be double") ;
}
if (nel)
{
/* check number of elements */
nnel = mxGetNumberOfElements (A) ;
if (m >= 0 && n >= 0 && m*n != nnel) mexErrMsgTxt ("wrong length") ;
}
else
{
/* check row and/or column dimensions */
if (m >= 0 && m != mm) mexErrMsgTxt ("wrong dimension") ;
if (n >= 0 && n != nn) mexErrMsgTxt ("wrong dimension") ;
}
if (square && mm != nn) mexErrMsgTxt ("matrix must be square") ;
}
/* get a real (or pattern) MATLAB sparse matrix and convert to cs_dl */
cs_dl *cs_dl_mex_get_sparse (cs_dl *A, int square, int values,
const mxArray *Amatlab)
{
cs_mex_check (0, -1, -1, square, 1, values, Amatlab) ;
A->m = mxGetM (Amatlab) ;
A->n = mxGetN (Amatlab) ;
A->p = (int64_t *) mxGetJc (Amatlab) ;
A->i = (int64_t *) mxGetIr (Amatlab) ;
A->x = values ? mxGetPr (Amatlab) : NULL ;
A->nzmax = mxGetNzmax (Amatlab) ;
A->nz = -1 ; /* denotes a compressed-col matrix, instead of triplet */
return (A) ;
}
/* return a real sparse matrix to MATLAB */
mxArray *cs_dl_mex_put_sparse (cs_dl **Ahandle)
{
cs_dl *A ;
mxArray *Amatlab ;
if (!Ahandle || !CS_CSC ((*Ahandle))) mexErrMsgTxt ("invalid sparse matrix") ;
A = *Ahandle ;
Amatlab = mxCreateSparse (0, 0, 0, mxREAL) ;
mxSetM (Amatlab, A->m) ;
mxSetN (Amatlab, A->n) ;
mxSetNzmax (Amatlab, A->nzmax) ;
cs_dl_free (mxGetJc (Amatlab)) ;
cs_dl_free (mxGetIr (Amatlab)) ;
cs_dl_free (mxGetPr (Amatlab)) ;
mxSetJc (Amatlab, (void *) (A->p)) ; /* assign A->p pointer to MATLAB A */
mxSetIr (Amatlab, (void *) (A->i)) ;
if (A->x == NULL)
{
/* A is a pattern only matrix; return all 1's to MATLAB */
int64_t i, nz ;
nz = A->p [A->n] ;
A->x = cs_dl_malloc (CS_MAX (nz,1), sizeof (double)) ;
for (i = 0 ; i < nz ; i++)
{
A->x [i] = 1 ;
}
}
mxSetPr (Amatlab, A->x) ;
cs_dl_free (A) ; /* frees A struct only, not A->p, etc */
*Ahandle = NULL ;
return (Amatlab) ;
}
/* get a real MATLAB dense column vector */
double *cs_dl_mex_get_double (int64_t n, const mxArray *X)
{
cs_mex_check (0, n, 1, 0, 0, 1, X) ;
return (mxGetPr (X)) ;
}
/* return a double vector to MATLAB */
double *cs_dl_mex_put_double (int64_t n, const double *b, mxArray **X)
{
double *x ;
int64_t k ;
*X = mxCreateDoubleMatrix (n, 1, mxREAL) ; /* create x */
x = mxGetPr (*X) ;
for (k = 0 ; k < n ; k++) x [k] = b [k] ; /* copy x = b */
return (x) ;
}
/* get a MATLAB flint array and convert to int64_t */
int64_t *cs_dl_mex_get_int (int64_t n, const mxArray *Imatlab, int64_t *imax,
int lo)
{
double *p ;
int64_t i, k, *C = cs_dl_malloc (n, sizeof (int64_t)) ;
cs_mex_check (1, n, 1, 0, 0, 1, Imatlab) ;
if (mxIsComplex (Imatlab))
{
mexErrMsgTxt ("integer input cannot be complex") ;
}
p = mxGetPr (Imatlab) ;
*imax = 0 ;
for (k = 0 ; k < n ; k++)
{
i = p [k] ;
C [k] = i - 1 ;
if (i < lo) mexErrMsgTxt ("index out of bounds") ;
*imax = CS_MAX (*imax, i) ;
}
return (C) ;
}
/* return an int64_t array to MATLAB as a flint row vector */
mxArray *cs_dl_mex_put_int (int64_t *p, int64_t n, int64_t offset, int do_free)
{
mxArray *X = mxCreateDoubleMatrix (1, n, mxREAL) ;
double *x = mxGetPr (X) ;
int64_t k ;
for (k = 0 ; k < n ; k++) x [k] = (p ? p [k] : k) + offset ;
if (do_free) cs_dl_free (p) ;
return (X) ;
}
#ifndef NCOMPLEX
/* copy a MATLAB real or complex vector into a cs_cl complex vector */
static cs_complex_t *cs_cl_get_vector (int64_t n, int64_t size,
const mxArray *Xmatlab)
{
int64_t p ;
double *X, *Z ;
cs_complex_t *Y ;
X = mxGetPr (Xmatlab) ;
Z = (mxIsComplex (Xmatlab)) ? mxGetPi (Xmatlab) : NULL ;
Y = cs_dl_malloc (size, sizeof (cs_complex_t)) ;
for (p = 0 ; p < n ; p++)
{
Y [p] = X [p] + I * (Z ? Z [p] : 0) ;
}
return (Y) ;
}
/* get a real or complex MATLAB sparse matrix and convert to cs_cl */
cs_cl *cs_cl_mex_get_sparse (cs_cl *A, int square, const mxArray *Amatlab)
{
cs_mex_check (0, -1, -1, square, 1, 1, Amatlab) ;
A->m = mxGetM (Amatlab) ;
A->n = mxGetN (Amatlab) ;
A->p = (int64_t *) mxGetJc (Amatlab) ;
A->i = (int64_t *) mxGetIr (Amatlab) ;
A->nzmax = mxGetNzmax (Amatlab) ;
A->x = cs_cl_get_vector (A->p [A->n], A->nzmax, Amatlab) ;
A->nz = -1 ; /* denotes a compressed-col matrix, instead of triplet */
return (A) ;
}
/* return a complex sparse matrix to MATLAB */
mxArray *cs_cl_mex_put_sparse (cs_cl **Ahandle)
{
cs_cl *A ;
double *x, *z ;
mxArray *Amatlab ;
int64_t k ;
if (!Ahandle || !CS_CSC ((*Ahandle))) mexErrMsgTxt ("invalid sparse matrix") ;
A = *Ahandle ;
if (A->x == NULL) mexErrMsgTxt ("invalid complex sparse matrix") ;
Amatlab = mxCreateSparse (0, 0, 0, mxCOMPLEX) ;
mxSetM (Amatlab, A->m) ;
mxSetN (Amatlab, A->n) ;
mxSetNzmax (Amatlab, A->nzmax) ;
cs_dl_free (mxGetJc (Amatlab)) ;
cs_dl_free (mxGetIr (Amatlab)) ;
cs_dl_free (mxGetPr (Amatlab)) ;
cs_dl_free (mxGetPi (Amatlab)) ;
mxSetJc (Amatlab, (void *) (A->p)) ; /* assign A->p pointer to MATLAB A */
mxSetIr (Amatlab, (void *) (A->i)) ;
x = cs_dl_malloc (A->nzmax, sizeof (double)) ;
z = cs_dl_malloc (A->nzmax, sizeof (double)) ;
for (k = 0 ; k < A->nzmax ; k++)
{
x [k] = creal (A->x [k]) ; /* copy and split numerical values */
z [k] = cimag (A->x [k]) ;
}
cs_cl_free (A->x) ; /* free copy of complex values */
mxSetPr (Amatlab, x) ; /* x and z will not be NULL, even if nz==0 */
mxSetPi (Amatlab, z) ;
cs_dl_free (A) ; /* frees A struct only, not A->p, etc */
*Ahandle = NULL ;
return (Amatlab) ;
}
/* get a real or complex MATLAB dense column vector, and copy to cs_complex_t */
cs_complex_t *cs_cl_mex_get_double (int64_t n, const mxArray *X)
{
cs_mex_check (0, n, 1, 0, 0, 1, X) ;
return (cs_cl_get_vector (n, n, X)) ;
}
/* copy a complex vector back to MATLAB and free it */
mxArray *cs_cl_mex_put_double (int64_t n, cs_complex_t *b)
{
double *x, *z ;
mxArray *X ;
int64_t k ;
X = mxCreateDoubleMatrix (n, 1, mxCOMPLEX) ; /* create x */
x = mxGetPr (X) ;
z = mxGetPi (X) ;
for (k = 0 ; k < n ; k++)
{
x [k] = creal (b [k]) ; /* copy x = b */
z [k] = cimag (b [k]) ;
}
cs_cl_free (b) ;
return (X) ;
}
#endif
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