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//------------------------------------------------------------------------------
// GxB_Row_subassign: C(row,Cols)<M'> = accum (C(row,Cols),u')
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Compare with GrB_Row_assign, which uses the M and C_replace differently
#include "GB_subassign.h"
#include "GB_get_mask.h"
GrB_Info GxB_Row_subassign // C(row,Cols)<M'> += u'
(
GrB_Matrix C, // input/output matrix for results
const GrB_Vector M_in, // mask for C(row,Cols), unused if NULL
const GrB_BinaryOp accum, // optional accum for z=accum(C(row,Cols),t)
const GrB_Vector u, // input vector
GrB_Index row, // row index
const GrB_Index *Cols, // column indices
GrB_Index nCols, // number of column indices
const GrB_Descriptor desc // descriptor for C(row,Cols) and M
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE (C, "GxB_Row_subassign (C, M, accum, u, row, Cols, nCols, desc)") ;
GB_BURBLE_START ("GxB_subassign") ;
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(row,Cols)<M'> = accum (C(row,Cols), u')
//--------------------------------------------------------------------------
// construct the row index list Rows = [ row ] of length nRows = 1
GrB_Index Rows [1] ;
Rows [0] = row ;
info = GB_subassign (
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(Rows,col),u)
(GrB_Matrix) u, true, // u as a matrix; always transposed
Rows, 1, // a single row index
Cols, nCols, // column indices
false, NULL, GB_ignore_code, // no scalar expansion
Context) ;
GB_BURBLE_END ;
return (info) ;
}
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