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//------------------------------------------------------------------------------
// GB_mex_Matrix_isStoredElement: interface for x = A(i,j)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// x = A (i,j), where i and j are zero-based. If i and j arrays, then
// x (k) = A (i (k), j (k)) is done for all k.
// I and J and zero-based
#include "GB_mex.h"
#define USAGE "x = GB_mex_Matrix_isStoredElement (A, I, J)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&A) ; \
GB_mx_put_global (true) ; \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix A = NULL ;
uint64_t *I = NULL, ni = 0, I_range [3] ; // OK
uint64_t *J = NULL, nj = 0, J_range [3] ; // OK
bool is_list ;
// check inputs
if (nargout > 1 || nargin < 3 || nargin > 5)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// get A (shallow copy)
A = GB_mx_mxArray_to_Matrix (pargin [0], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
// get I
if (!GB_mx_mxArray_to_indices (pargin [1], &I, &ni, I_range, &is_list,
NULL))
{
FREE_ALL ;
mexErrMsgTxt ("I failed") ;
}
if (!is_list)
{
FREE_ALL ;
mexErrMsgTxt ("I is invalid; must be a list") ;
}
// get J
if (!GB_mx_mxArray_to_indices (pargin [2], &J, &nj, J_range, &is_list,
NULL))
{
FREE_ALL ;
mexErrMsgTxt ("J failed") ;
}
if (!is_list)
{
FREE_ALL ;
mexErrMsgTxt ("J is invalid; must be a list") ;
}
if (ni != nj)
{
FREE_ALL ;
mexErrMsgTxt ("I and J must be the same size") ;
}
// create output X
pargout [0] = GB_mx_create_full (ni, 1, GrB_BOOL) ;
bool *X = (bool *) mxGetData (pargout [0]) ;
// x = A (i,j)
for (int64_t k = 0 ; k < ni ; k++)
{
GrB_Info info = GxB_Matrix_isStoredElement (A, I [k], J [k]) ;
X [k] = (info == GrB_SUCCESS) ;
}
FREE_ALL ;
}
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