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// CXSparse/MATLAB/CSparse/cs_droptol_mex: drop small entries
// CXSparse, Copyright (c) 2006-2022, Timothy A. Davis. All Rights Reserved.
// SPDX-License-Identifier: LGPL-2.1+
#include "cs_mex.h"
/* cs_droptol: remove small entries from A */
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
int64_t j, k ;
double tol ;
if (nargout > 1 || nargin != 2)
{
mexErrMsgTxt ("Usage: C = cs_droptol(A,tol)") ;
}
tol = mxGetScalar (pargin [1]) ; /* get tol */
if (mxIsComplex (pargin [0]))
{
#ifndef NCOMPLEX
cs_cl Amatrix, *C, *A ;
A = cs_cl_mex_get_sparse (&Amatrix, 0, pargin [0]) ; /* get A */
C = cs_cl_spalloc (A->m, A->n, A->nzmax, 1, 0) ; /* C = A */
for (j = 0 ; j <= A->n ; j++) C->p [j] = A->p [j] ;
for (k = 0 ; k < A->nzmax ; k++) C->i [k] = A->i [k] ;
for (k = 0 ; k < A->nzmax ; k++) C->x [k] = A->x [k] ;
cs_cl_droptol (C, tol) ; /* drop from C */
pargout [0] = cs_cl_mex_put_sparse (&C) ; /* return C */
#else
mexErrMsgTxt ("complex matrices not supported") ;
#endif
}
else
{
cs_dl Amatrix, *C, *A ;
A = cs_dl_mex_get_sparse (&Amatrix, 0, 1, pargin [0]) ; /* get A */
C = cs_dl_spalloc (A->m, A->n, A->nzmax, 1, 0) ; /* C = A */
for (j = 0 ; j <= A->n ; j++) C->p [j] = A->p [j] ;
for (k = 0 ; k < A->nzmax ; k++) C->i [k] = A->i [k] ;
for (k = 0 ; k < A->nzmax ; k++) C->x [k] = A->x [k] ;
cs_dl_droptol (C, tol) ; /* drop from C */
pargout [0] = cs_dl_mex_put_sparse (&C) ; /* return C */
}
}
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