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//------------------------------------------------------------------------------
// GrB_Col_assign: C<M>(Rows,col) = accum (C(Rows,col),u)
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Compare with GxB_Col_subassign, which uses the M and C_replace differently
#include "GB_assign.h"
#include "GB_bitmap_assign.h"
#include "GB_get_mask.h"
GrB_Info GrB_Col_assign // C<M>(Rows,col) = accum (C(Rows,col),u)
(
GrB_Matrix C, // input/output matrix for results
const GrB_Vector M_in, // mask for C(:,col), unused if NULL
const GrB_BinaryOp accum, // optional accum for z=accum(C(Rows,col),t)
const GrB_Vector u, // input vector
const GrB_Index *Rows, // row indices
GrB_Index nRows, // number of row indices
GrB_Index col, // column index
const GrB_Descriptor desc // descriptor for C(:,col) and M
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE (C, "GrB_Col_assign (C, M, accum, u, Rows, nRows, col, desc)") ;
GB_BURBLE_START ("GrB_assign") ;
GB_RETURN_IF_NULL_OR_FAULTY (C) ;
GB_RETURN_IF_FAULTY (M_in) ;
GB_RETURN_IF_NULL_OR_FAULTY (u) ;
ASSERT (M_in == NULL || GB_VECTOR_OK (M_in)) ;
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) M_in, &Mask_comp, &Mask_struct) ;
//--------------------------------------------------------------------------
// C(Rows,col)<M> = accum (C(Rows,col), u)
//--------------------------------------------------------------------------
// construct the column index list Cols = [ col ] of length nCols = 1
GrB_Index Cols [1] ;
Cols [0] = col ;
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(Rows,col),u)
(GrB_Matrix) u, false, // u as a matrix; never transposed
Rows, nRows, // row indices
Cols, 1, // a single column index
false, NULL, GB_ignore_code, // no scalar expansion
GB_COL_ASSIGN,
Context) ;
GB_BURBLE_END ;
return (info) ;
}
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