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//------------------------------------------------------------------------------
// GxB_Matrix_eWiseUnion: matrix element-wise operations, set union
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// C<M> = accum (C,A+B) and variations.
// if A(i,j) and B(i,j) both appear:
// C(i,j) = add (A(i,j), B(i,j))
// else if A(i,j) appears but B(i,j) does not:
// C(i,j) = add (A(i,j), beta)
// else if A(i,j) does not appear but B(i,j) does:
// C(i,j) = add (alpha, B(i,j))
// by contrast, GrB_eWiseAdd does the following:
// if A(i,j) and B(i,j) both appear:
// C(i,j) = add (A(i,j), B(i,j))
// else if A(i,j) appears but B(i,j) does not:
// C(i,j) = A(i,j)
// else if A(i,j) does not appear but B(i,j) does:
// C(i,j) = B(i,j)
#include "ewise/GB_ewise.h"
#include "mask/GB_get_mask.h"
//------------------------------------------------------------------------------
// GxB_Matrix_eWiseUnion: matrix addition
//------------------------------------------------------------------------------
GrB_Info GxB_Matrix_eWiseUnion // C<M> = accum (C, A+B)
(
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 GrB_BinaryOp op, // defines '+' for T=A+B
const GrB_Matrix A, // first input: matrix A
const GrB_Scalar alpha,
const GrB_Matrix B, // second input: matrix B
const GrB_Scalar beta,
const GrB_Descriptor desc // descriptor for C, M, A, and B
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_RETURN_IF_NULL (C) ;
GB_RETURN_IF_NULL (A) ;
GB_RETURN_IF_NULL (B) ;
GB_RETURN_IF_NULL (alpha) ;
GB_RETURN_IF_NULL (beta) ;
GB_RETURN_IF_NULL_OR_FAULTY (op) ;
GB_RETURN_IF_OUTPUT_IS_READONLY (C) ;
GB_WHERE6 (C, M_in, A, alpha, B, beta,
"GxB_Matrix_eWiseUnion (C, M, accum, op, A, alpha, B, beta, desc)") ;
GB_BURBLE_START ("GxB_eWiseUnion") ;
// get the descriptor
GB_GET_DESCRIPTOR (info, desc, C_replace, Mask_comp, Mask_struct, A_tran,
B_tran, xx, xx7) ;
// get the mask
GrB_Matrix M = GB_get_mask (M_in, &Mask_comp, &Mask_struct) ;
//--------------------------------------------------------------------------
// apply the eWise kernel (using set union)
//--------------------------------------------------------------------------
// C<M> = accum (C,T) where T = A+B, A'+B, A+B', or A'+B'
info = GB_ewise (
C, C_replace, // C and its descriptor
M, Mask_comp, Mask_struct, // mask and its descriptor
accum, // accumulate operator
op, // operator that defines '+'
A, A_tran, // A matrix and its descriptor
B, B_tran, // B matrix and its descriptor
true, // eWiseAdd
true, alpha, beta, // eWiseUnion
Werk) ;
GB_BURBLE_END ;
return (info) ;
}
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