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//------------------------------------------------------------------------------
// GB_spones_mex: like spones(A) in MATLAB but do not drop zeros on input
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// The MATLAB built-in function spones(A) has changed, as of MATLAB R2019b.
// It now drops zeros on input. Prior versions converted them to 1 on output.
// The tests here use the old behavior, so this function replaces spones(A)
// with GB_spones_mex (A), which has the old behavior of spones.
#include "mex.h"
#include <string.h>
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
if (nargin != 1 || nargout > 1 || !mxIsSparse (pargin [0]))
{
mexErrMsgTxt ("usage: C = GB_spones_mex (A), A must be sparse") ;
}
//--------------------------------------------------------------------------
// get the input matrix
//--------------------------------------------------------------------------
mwSize m = mxGetM (pargin [0]) ;
mwSize n = mxGetN (pargin [0]) ;
mwIndex *Ap = mxGetJc (pargin [0]) ;
mwIndex *Ai = mxGetIr (pargin [0]) ;
mwSize nz = Ap [n] ;
//--------------------------------------------------------------------------
// create the output matrix
//--------------------------------------------------------------------------
pargout [0] = mxCreateSparse (m, n, nz+1, mxREAL) ;
mwIndex *Cp = mxGetJc (pargout [0]) ;
mwIndex *Ci = mxGetIr (pargout [0]) ;
double *Cx = mxGetDoubles (pargout [0]) ;
memcpy (Cp, Ap, (n+1) * sizeof (mwIndex)) ;
memcpy (Ci, Ai, nz * sizeof (mwIndex)) ;
for (mwSize p = 0 ; p < nz ; p++)
{
Cx [p] = 1 ;
}
}
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