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//------------------------------------------------------------------------------
// GB_mex_Matrix_subref: C=A(I,J)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "GB_mex.h"
#define USAGE "C = GB_mex_Matrix_subref (A, I, J)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&A) ; \
GrB_Matrix_free_(&C) ; \
GB_mx_put_global (true) ; \
}
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
struct GB_Matrix_opaque C_header ;
GrB_Matrix C = GB_clear_matrix_header (&C_header) ;
bool malloc_debug = GB_mx_get_global (true) ;
GrB_Matrix A = NULL ;
uint64_t *I = NULL, ni = 0, I_range [3] ;
uint64_t *J = NULL, nj = 0, J_range [3] ;
bool ignore ;
// check inputs
GB_WERK (USAGE) ;
if (nargout > 1 || nargin != 3)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
#define GET_DEEP_COPY ;
#define FREE_DEEP_COPY ;
// get A (shallow copy)
A = GB_mx_mxArray_to_Matrix (pargin [0], "A", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
// get I
if (!GB_mx_mxArray_to_indices (pargin [1], &I, &ni, I_range, &ignore, NULL))
{
FREE_ALL ;
mexErrMsgTxt ("I failed") ;
}
// get J
if (!GB_mx_mxArray_to_indices (pargin [2], &J, &nj, J_range, &ignore, NULL))
{
FREE_ALL ;
mexErrMsgTxt ("J failed") ;
}
bool I_is_32 = false ;
bool J_is_32 = false ;
// C = A(I,J), numeric not symbolic
METHOD (GB_subref (C, C->iso, true, A, I, I_is_32, ni, J, J_is_32, nj,
false, Werk)) ;
// return C
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C subref result", false) ;
FREE_ALL ;
}
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