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//------------------------------------------------------------------------------
// GrB_Col_assign: 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"
GrB_Info GrB_Col_assign // C<M>(I,j) = accum (C(I,j),u)
(
GrB_Matrix C, // input/output matrix for results
const GrB_Vector mask, // optional mask for C(:,j), unused if NULL
const GrB_BinaryOp accum, // optional accum for z=accum(C(I,j),t)
const GrB_Vector u, // input vector
const uint64_t *I, // row indices
uint64_t ni, // number of row indices
uint64_t j, // column index
const GrB_Descriptor desc // descriptor for C(:,j) and M
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE3 (C, mask, u,
"GrB_Col_assign (C, M, accum, u, I, ni, j, desc)") ;
GB_RETURN_IF_NULL (C) ;
GB_RETURN_IF_NULL (u) ;
GB_RETURN_IF_OUTPUT_IS_READONLY (C) ;
GB_BURBLE_START ("GrB_assign") ;
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) ;
//--------------------------------------------------------------------------
// C(I,j)<M> = accum (C(I,j), u)
//--------------------------------------------------------------------------
// construct the index list J = [ j ] of length nj = 1
uint64_t J [1] ;
J [0] = j ;
info = GB_assign (
C, C_replace, // C matrix and its descriptor
M, Mask_comp, Mask_struct, // mask and its descriptor
false, // do not transpose the mask
accum, // for accum (C(I,j),u)
(GrB_Matrix) u, false, // u as a matrix; never transposed
I, false, ni, // row indices
J, false, 1, // a single column index
false, NULL, GB_ignore_code, // no scalar expansion
GB_COL_ASSIGN,
Werk) ;
GB_BURBLE_END ;
return (info) ;
}
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