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//------------------------------------------------------------------------------
// GxB_Matrix_select: select entries from a matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// C<M> = accum(C,select(A,k)) or accum(C,select(A',))
#include "GB_select.h"
#include "GB_get_mask.h"
GrB_Info GxB_Matrix_select // C<M> = accum (C, select(A,k)) or select(A',k)
(
GrB_Matrix C, // input/output matrix for results
const GrB_Matrix M_in, // optional mask for C, unused if NULL
const GrB_BinaryOp accum, // optional accum for Z=accum(C,T)
const GxB_SelectOp op, // operator to select the entries
const GrB_Matrix A, // first input: matrix A
const GrB_Scalar Thunk, // optional input for select operator
const GrB_Descriptor desc // descriptor for C, M, and A
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE (C, "GxB_Matrix_select (C, M, accum, op, A, Thunk, desc)") ;
GB_BURBLE_START ("GxB_select") ;
GB_RETURN_IF_NULL_OR_FAULTY (C) ;
GB_RETURN_IF_FAULTY (M_in) ;
GB_RETURN_IF_NULL_OR_FAULTY (A) ;
// get the descriptor
GB_GET_DESCRIPTOR (info, desc, C_replace, Mask_comp, Mask_struct,
A_transpose, xx1, xx2, xx7) ;
// get the mask
GrB_Matrix M = GB_get_mask (M_in, &Mask_comp, &Mask_struct) ;
//--------------------------------------------------------------------------
// select the entries and optionally transpose; assemble pending tuples
//--------------------------------------------------------------------------
info = GB_select (
C, C_replace, // C and its descriptor
M, Mask_comp, Mask_struct, // mask and its descriptor
accum, // optional accum for Z=accum(C,T)
(GB_Operator) op, // operator to select the entries
A, // first input: A
Thunk, // optional input for select operator
A_transpose, // descriptor for A
Context) ;
GB_BURBLE_END ;
return (info) ;
}
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