1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
//------------------------------------------------------------------------------
// GrB_Row_assign: C<M'>(i,J) = accum (C(i,J),u')
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "assign/GB_assign.h"
#include "mask/GB_get_mask.h"
GrB_Info GrB_Row_assign // C<mask'>(i,J) = accum (C(i,J),u')
(
GrB_Matrix C, // input/output matrix for results
const GrB_Vector mask, // optional mask for C(i,:), unused if NULL
const GrB_BinaryOp accum, // optional accum for z=accum(C(i,J),t)
const GrB_Vector u, // input vector
uint64_t i, // row index
const uint64_t *J, // column indices
uint64_t nj, // number of column indices
const GrB_Descriptor desc // descriptor for C(i,:) and mask
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GB_WHERE3 (C, mask, u,
"GrB_Row_assign (C, M, accum, u, i, J, nj, desc)") ;
GB_RETURN_IF_NULL (C) ;
GB_RETURN_IF_NULL (u) ;
GB_RETURN_IF_OUTPUT_IS_READONLY (C) ;
GB_BURBLE_START ("GrB_assign") ;
ASSERT (mask == NULL || GB_VECTOR_OK (mask)) ;
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) mask, &Mask_comp, &Mask_struct) ;
//--------------------------------------------------------------------------
// C<M'>(i,J) = accum (C(i,J), u')
//--------------------------------------------------------------------------
// construct the index list I = [ i ] of length ni = 1
uint64_t I [1] ;
I [0] = i ; // OK: 64-bit only
info = GB_assign (
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(i,J),u)
(GrB_Matrix) u, true, // u as a matrix; always transposed
I, false, 1, // a single row index (64-bit)
J, false, nj, // column indices (64-bit)
false, NULL, GB_ignore_code, // no scalar expansion
GB_ROW_ASSIGN,
Werk) ;
GB_BURBLE_END ;
return (info) ;
}
|
