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//------------------------------------------------------------------------------
// GB_mex_Matrix_extract: interface for C<Mask> = accum (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_extract" \
" (C, Mask, accum, A, I, J, desc, method)"
#define FREE_ALL \
{ \
GrB_Matrix_free_(&C) ; \
GrB_Matrix_free_(&Mask) ; \
GrB_Matrix_free_(&A) ; \
GrB_Vector_free_(&I_vector) ; \
GrB_Vector_free_(&J_vector) ; \
GrB_Descriptor_free_(&desc) ; \
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 C = NULL ;
GrB_Matrix Mask = NULL ;
GrB_Matrix A = NULL ;
GrB_Vector I_vector = NULL, J_vector = NULL ;
GrB_Descriptor desc = NULL ;
uint64_t *I = NULL, ni = 0, I_range [3] ;
uint64_t *J = NULL, nj = 0, J_range [3] ;
bool ignore ;
// check inputs
if (nargout > 1 || nargin < 6 || nargin > 8)
{
mexErrMsgTxt ("Usage: " USAGE) ;
}
// get C (make a deep copy)
#define GET_DEEP_COPY \
C = GB_mx_mxArray_to_Matrix (pargin [0], "C input", true, true) ;
#define FREE_DEEP_COPY GrB_Matrix_free_(&C) ;
GET_DEEP_COPY ;
if (C == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("C failed") ;
}
// get Mask (shallow copy)
Mask = GB_mx_mxArray_to_Matrix (pargin [1], "Mask", false, false) ;
if (Mask == NULL && !mxIsEmpty (pargin [1]))
{
FREE_ALL ;
mexErrMsgTxt ("Mask failed") ;
}
// get A (shallow copy)
A = GB_mx_mxArray_to_Matrix (pargin [3], "A input", false, true) ;
if (A == NULL)
{
FREE_ALL ;
mexErrMsgTxt ("A failed") ;
}
// get accum, if present
bool user_complex = (Complex != GxB_FC64)
&& (C->type == Complex || A->type == Complex) ;
GrB_BinaryOp accum ;
if (!GB_mx_mxArray_to_BinaryOp (&accum, pargin [2], "accum",
C->type, user_complex))
{
FREE_ALL ;
mexErrMsgTxt ("accum failed") ;
}
// get the method: 0: use (uint64_t *), 1: use GrB_Vector for I,J
int GET_SCALAR (7, int, method, 0) ;
// get I
if (!GB_mx_mxArray_to_indices (pargin [4], &I, &ni, I_range, &ignore,
(method == 0) ? NULL : &I_vector))
{
FREE_ALL ;
mexErrMsgTxt ("I failed") ;
}
// get J
if (!GB_mx_mxArray_to_indices (pargin [5], &J, &nj, J_range, &ignore,
(method == 0) ? NULL : &J_vector))
{
FREE_ALL ;
mexErrMsgTxt ("J failed") ;
}
// get desc
if (!GB_mx_mxArray_to_Descriptor (&desc, PARGIN (6), "desc"))
{
FREE_ALL ;
mexErrMsgTxt ("desc failed") ;
}
// C<Mask> = accum (C,A(I,J))
if (method == 0)
{
METHOD (GrB_Matrix_extract_(C, Mask, accum, A, I, ni, J, nj, desc)) ;
}
else
{
METHOD (GxB_Matrix_extract_Vector_(C, Mask, accum, A,
I_vector, J_vector, desc)) ;
}
// return C as a struct and free the GraphBLAS C
pargout [0] = GB_mx_Matrix_to_mxArray (&C, "C output", true) ;
FREE_ALL ;
}
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