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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
//------------------------------------------------------------------------------
// GB_Scalar_reduce: reduce a matrix to a GrB_Scalar
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#include "GB_reduce.h"
#define GB_FREE_ALL GB_phybix_free ((GrB_Matrix) S) ;
GrB_Info GB_Scalar_reduce
(
GrB_Scalar S, // result scalar
const GrB_BinaryOp accum, // optional accum for c=accum(c,t)
const GrB_Monoid monoid, // monoid to do the reduction
const GrB_Matrix A, // matrix to reduce
GB_Context Context
)
{
//--------------------------------------------------------------------------
// check inputs (accum and monoid are checked in GB_reduce_to_scalar)
//--------------------------------------------------------------------------
GrB_Info info ;
ASSERT_SCALAR_OK (S, "S for reduce to GrB_Scalar", GB0) ;
ASSERT_MATRIX_OK (A, "A for reduce to GrB_Scalar", GB0) ;
GBURBLE ("(to GrB_Scalar) ") ;
//--------------------------------------------------------------------------
// check if A is empty
//--------------------------------------------------------------------------
GrB_Index nvals ;
GB_OK (GB_nvals (&nvals, A, Context)) ;
if (nvals == 0)
{
// no work to do, except to clear S if there is no accum operator
if (accum == NULL)
{
GB_OK (GB_clear ((GrB_Matrix) S, Context)) ;
}
return (GrB_SUCCESS) ;
}
//--------------------------------------------------------------------------
// ensure S is bitmap or full
//--------------------------------------------------------------------------
if (GB_IS_FULL (S))
{
// nothing to do
nvals = 1 ;
}
else
{
// convert S to bitmap
GB_OK (GB_convert_any_to_bitmap ((GrB_Matrix) S, Context)) ;
nvals = S->nvals ;
}
//--------------------------------------------------------------------------
// reduce to the GrB_Scalar
//--------------------------------------------------------------------------
// ignore accum if S has no entry on input
GrB_BinaryOp accum_op = (nvals == 0) ? NULL : accum ;
GB_OK (GB_reduce_to_scalar (S->x, S->type, accum_op, monoid, A, Context)) ;
//--------------------------------------------------------------------------
// ensure S is full
//--------------------------------------------------------------------------
if (GB_IS_BITMAP (S))
{
S->b [0] = 1 ;
S->nvals = 1 ;
GB_convert_any_to_full ((GrB_Matrix) S) ;
}
S->iso = true ;
ASSERT_SCALAR_OK (S, "S result for reduce to GrB_Scalar", GB0) ;
return (GrB_SUCCESS) ;
}
|
