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//------------------------------------------------------------------------------
// GxB_Row_assign_Vector: C<M'>(i,J) = accum (C(i,J),u')
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "assign/GB_assign.h"
#include "mask/GB_get_mask.h"
#include "ij/GB_ij.h"
#define GB_FREE_ALL \
if (J_size > 0) GB_FREE_MEMORY (&J, J_size) ;
GrB_Info GxB_Row_assign_Vector // C<mask'>(i,J) = accum(C(i,j),u')
(
GrB_Matrix C, // input/output matrix for results
const GrB_Vector mask, // mask for C(i,:), unused if NULL
const GrB_BinaryOp accum, // optional accum for z=accum(C(i,J),t)
const GrB_Vector u, // input vector
uint64_t i, // row index
const GrB_Vector J_vector, // column indices
const GrB_Descriptor desc // descriptor for C(i,:) and mask
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_RETURN_IF_NULL (C) ;
GB_RETURN_IF_NULL (u) ;
GB_RETURN_IF_OUTPUT_IS_READONLY (C) ;
GB_WHERE4 (C, mask, u, J_vector,
"GxB_Row_assign_Vector (C, M, accum, u, i, J, desc)") ;
GB_BURBLE_START ("GxB_Row_assign_Vector") ;
ASSERT (mask == NULL || GB_VECTOR_OK (mask)) ;
ASSERT (GB_VECTOR_OK (u)) ;
// get the descriptor
GB_GET_DESCRIPTOR (info, desc, C_replace, Mask_comp, Mask_struct,
xx1, xx2, xx3, xx7) ;
// get the mask
GrB_Matrix M = GB_get_mask ((GrB_Matrix) mask, &Mask_comp, &Mask_struct) ;
//--------------------------------------------------------------------------
// get the index vector
//--------------------------------------------------------------------------
void *J = NULL ;
size_t J_size = 0 ;
int64_t nj = 0 ;
GrB_Type J_type = NULL ;
GB_OK (GB_ijxvector (J_vector, false, 1, desc, false,
&J, &nj, &J_size, &J_type, Werk)) ;
bool J_is_32 = (J_type == GrB_UINT32) ;
//--------------------------------------------------------------------------
// C<M'>(i,J) = accum (C(i,J), u')
//--------------------------------------------------------------------------
// construct the index list I = [ i ] of length ni = 1
uint64_t I [1] ;
I [0] = i ; // OK: 64-bit only
GB_OK (GB_assign (
C, C_replace, // C matrix and its descriptor
M, Mask_comp, Mask_struct, // mask and its descriptor
true, // transpose the mask
accum, // for accum (C(i,J),u)
(GrB_Matrix) u, true, // u as a matrix; always transposed
I, false, 1, // a single row index (64-bit only)
J, J_is_32, nj, // column indices
false, NULL, GB_ignore_code, // no scalar expansion
GB_ROW_ASSIGN,
Werk)) ;
//--------------------------------------------------------------------------
// free workspace and return result
//--------------------------------------------------------------------------
GB_FREE_ALL ;
GB_BURBLE_END ;
return (GrB_SUCCESS) ;
}
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