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// CXSparse/MATLAB/Test/cs_pvec_mex: permute a dense vector
// CXSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
// SPDX-License-Identifier: LGPL-2.1+
#include "cs_mex.h"
/* x = b(p) */
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
int64_t n, k, *p ;
double *xx ;
if (nargout > 1 || nargin != 2)
{
mexErrMsgTxt ("Usage: x = cs_pvec(b,p)") ;
}
n = mxGetNumberOfElements (pargin [0]) ;
if (n != mxGetNumberOfElements (pargin [1]))
{
mexErrMsgTxt ("b or p wrong size") ;
}
xx = mxGetPr (pargin [1]) ;
p = cs_dl_malloc (n, sizeof (int64_t)) ;
for (k = 0 ; k < n ; k++) p [k] = xx [k] - 1 ;
if (mxIsComplex (pargin [0]))
{
#ifdef NCOMPLEX
mexErrMsgTxt ("complex case not supported") ;
#else
cs_complex_t *x, *b ;
b = cs_cl_mex_get_double (n, pargin [0]) ;
x = cs_dl_malloc (n, sizeof (cs_complex_t)) ;
cs_cl_pvec (p, b, x, n) ;
pargout [0] = cs_cl_mex_put_double (n, x) ;
cs_cl_free (b) ; /* free copy of complex values */
#endif
}
else
{
double *x, *b ;
b = cs_dl_mex_get_double (n, pargin [0]) ;
pargout [0] = mxCreateDoubleMatrix (n, 1, mxREAL) ;
x = mxGetPr (pargout [0]) ;
cs_dl_pvec (p, b, x, n) ;
}
cs_dl_free (p) ;
}
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