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//------------------------------------------------------------------------------
// GrB_Vector_extract: w<M> = accum (w, u(I))
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "GB_extract.h"
#include "GB_get_mask.h"
GrB_Info GrB_Vector_extract // w<M> = accum (w, u(I))
(
GrB_Vector w, // input/output vector for results
const GrB_Vector M_in, // optional mask for w, unused if NULL
const GrB_BinaryOp accum, // optional accum for z=accum(w,t)
const GrB_Vector u, // first input: vector u
const GrB_Index *I, // row indices
GrB_Index ni, // number of row indices
const GrB_Descriptor desc // descriptor for w and M
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE (w, "GrB_Vector_extract (w, M, accum, u, I, ni, desc)") ;
GB_BURBLE_START ("GrB_extract") ;
GB_RETURN_IF_NULL_OR_FAULTY (w) ;
GB_RETURN_IF_FAULTY (M_in) ;
GB_RETURN_IF_NULL_OR_FAULTY (u) ;
ASSERT (GB_VECTOR_OK (w)) ;
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) ;
//--------------------------------------------------------------------------
// extract entries
//--------------------------------------------------------------------------
// If a column list J is constructed containing the single column index 0,
// then T = A(I,0) followed by C<M>=accum(C,T) does the right thing
// where all matrices (C, M, and T) are columns of size ni-by-1. Thus,
// GB_extract does the right thing for this case. Note that the input u is
// not transposed. All GrB_Matrix objects will be in CSC format, and no
// matrices are transposed via the C_is_vector option in GB_extract.
//--------------------------------------------------------------------------
// do the work in GB_extract
//--------------------------------------------------------------------------
info = GB_extract (
(GrB_Matrix) w, C_replace, // w as a matrix, and its descriptor
M, Mask_comp, Mask_struct, // mask and its descriptor
accum, // optional accum for z=accum(w,t)
(GrB_Matrix) u, false, // u as matrix; never transposed
I, ni, // row indices I and length ni
GrB_ALL, 1, // all columns
Context) ;
GB_BURBLE_END ;
return (info) ;
}
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