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// CXSparse/MATLAB/CSparse/cs_ltsolve_mex: x=L'\b where x,b are dense
// CXSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
// SPDX-License-Identifier: LGPL-2.1+
#include "cs_mex.h"
/* cs_ltsolve: solve an upper triangular system L'*x=b */
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
if (nargout > 1 || nargin != 2)
{
mexErrMsgTxt ("Usage: x = cs_ltsolve(L,b)") ;
}
if (mxIsComplex (pargin [0]) || mxIsComplex (pargin [1]))
{
#ifndef NCOMPLEX
cs_cl Lmatrix, *L ;
cs_complex_t *x ;
L = cs_cl_mex_get_sparse (&Lmatrix, 1, pargin [0]) ; /* get L */
x = cs_cl_mex_get_double (L->n, pargin [1]) ; /* x = b */
cs_cl_ltsolve (L, x) ; /* x = L'\x */
cs_cl_free (L->x) ;
pargout [0] = cs_cl_mex_put_double (L->n, x) ; /* return x */
#else
mexErrMsgTxt ("complex matrices not supported") ;
#endif
}
else
{
cs_dl Lmatrix, *L ;
double *x, *b ;
L = cs_dl_mex_get_sparse (&Lmatrix, 1, 1, pargin [0]) ; /* get L */
b = cs_dl_mex_get_double (L->n, pargin [1]) ; /* get b */
x = cs_dl_mex_put_double (L->n, b, &(pargout [0])) ; /* x = b */
cs_dl_ltsolve (L, x) ; /* x = L'\x */
}
}
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