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//------------------------------------------------------------------------------
// GrB_Matrix_extract: C<M> = accum (C, A(I,J)) or A(J,I)'
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "extract/GB_extract.h"
#include "mask/GB_get_mask.h"
GrB_Info GrB_Matrix_extract // C<M> = accum (C, A(I,J))
(
GrB_Matrix C, // input/output matrix for results
const GrB_Matrix Mask, // optional mask for C, unused if NULL
const GrB_BinaryOp accum, // optional accum for Z=accum(C,T)
const GrB_Matrix A, // first input: matrix A
const uint64_t *I, // row indices (64-bit)
uint64_t ni, // number of row indices
const uint64_t *J, // column indices (64-bit)
uint64_t nj, // number of column indices
const GrB_Descriptor desc // descriptor for C, M, and A
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE3 (C, Mask, A,
"GrB_Matrix_extract (C, M, accum, A, I, ni, J, nj, desc)") ;
GB_RETURN_IF_NULL (C) ;
GB_RETURN_IF_NULL (A) ;
GB_RETURN_IF_OUTPUT_IS_READONLY (C) ;
GB_BURBLE_START ("GrB_extract") ;
// get the descriptor
GB_GET_DESCRIPTOR (info, desc, C_replace, Mask_comp, Mask_struct,
A_transpose, xx1, xx2, xx7) ;
// get the mask
GrB_Matrix M = GB_get_mask (Mask, &Mask_comp, &Mask_struct) ;
//--------------------------------------------------------------------------
// do the work in GB_extract
//--------------------------------------------------------------------------
info = GB_extract (
C, C_replace, // output matrix C and its descriptor
M, Mask_comp, Mask_struct, // mask and its descriptor
accum, // optional accum for Z=accum(C,T)
A, A_transpose, // A and its descriptor
I, false, ni, // row indices (64-bit)
J, false, nj, // column indices (64-bit)
Werk) ;
GB_BURBLE_END ;
return (info) ;
}
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