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//------------------------------------------------------------------------------
// GxB_Matrix_extract_Vector: 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"
#include "ij/GB_ij.h"
#define GB_FREE_ALL \
if (I_size > 0) GB_FREE_MEMORY (&I, I_size) ; \
if (J_size > 0) GB_FREE_MEMORY (&J, J_size) ;
GrB_Info GxB_Matrix_extract_Vector // 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 GrB_Vector I_vector, // row indices
const GrB_Vector J_vector, // column indices
const GrB_Descriptor desc // descriptor for C, M, and A
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_RETURN_IF_NULL (C) ;
GB_RETURN_IF_NULL (A) ;
GB_RETURN_IF_OUTPUT_IS_READONLY (C) ;
GB_WHERE5 (C, Mask, A, I_vector, J_vector,
"GxB_Matrix_extract_Vector (C, M, accum, A, I, J, desc)") ;
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) ;
//--------------------------------------------------------------------------
// get the index vectors
//--------------------------------------------------------------------------
void *I = NULL, *J = NULL ;
size_t I_size = 0, J_size = 0 ;
int64_t ni = 0, nj = 0 ;
GrB_Type I_type = NULL, J_type = NULL ;
GB_OK (GB_ijxvector (I_vector, false, 0, desc, false,
&I, &ni, &I_size, &I_type, Werk)) ;
GB_OK (GB_ijxvector (J_vector, false, 1, desc, false,
&J, &nj, &J_size, &J_type, Werk)) ;
bool I_is_32 = (I_type == GrB_UINT32) ;
bool J_is_32 = (J_type == GrB_UINT32) ;
//--------------------------------------------------------------------------
// do the work in GB_extract
//--------------------------------------------------------------------------
GB_OK (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, I_is_32, ni, // row indices
J, J_is_32, nj, // column indices
Werk)) ;
//--------------------------------------------------------------------------
// free workspace and return result
//--------------------------------------------------------------------------
GB_FREE_ALL ;
GB_BURBLE_END ;
return (GrB_SUCCESS) ;
}
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