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// CXSparse/MATLAB/CSparse/cs_gaxpy: sparse matrix times dense vector
// CXSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
// SPDX-License-Identifier: LGPL-2.1+
#include "cs_mex.h"
/* z = cs_gaxpy (A,x,y) computes z = A*x+y */
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
if (nargout > 1 || nargin != 3)
{
mexErrMsgTxt ("Usage: z = cs_gaxpy(A,x,y)") ;
}
if (mxIsComplex (pargin [0]) || mxIsComplex (pargin [1])
|| mxIsComplex (pargin [2]))
{
#ifndef NCOMPLEX
cs_cl Amatrix, *A ;
cs_complex_t *x, *z ;
A = cs_cl_mex_get_sparse (&Amatrix, 0, pargin [0]) ;/* get A */
x = cs_cl_mex_get_double (A->n, pargin [1]) ; /* get x */
z = cs_cl_mex_get_double (A->m, pargin [2]) ; /* z = y */
cs_cl_gaxpy (A, x, z) ; /* z = z + A*x */
cs_cl_free (x) ;
cs_cl_free (A->x) ;
pargout [0] = cs_cl_mex_put_double (A->m, z) ; /* return z */
#else
mexErrMsgTxt ("complex matrices not supported") ;
#endif
}
else
{
cs_dl Amatrix, *A ;
double *x, *y, *z ;
A = cs_dl_mex_get_sparse (&Amatrix, 0, 1, pargin [0]) ;/* get A */
x = cs_dl_mex_get_double (A->n, pargin [1]) ; /* get x */
y = cs_dl_mex_get_double (A->m, pargin [2]) ; /* get y */
z = cs_dl_mex_put_double (A->m, y, &(pargout [0])) ; /* z = y */
cs_dl_gaxpy (A, x, z) ; /* z = z + A*x */
}
}
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