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
//------------------------------------------------------------------------------
// LAGraph_Vector_Structure: return the structure of a vector
//------------------------------------------------------------------------------
// LAGraph, (c) 2019-2022 by The LAGraph Contributors, All Rights Reserved.
// SPDX-License-Identifier: BSD-2-Clause
//
// For additional details (including references to third party source code and
// other files) see the LICENSE file or contact permission@sei.cmu.edu. See
// Contributors.txt for a full list of contributors. Created, in part, with
// funding and support from the U.S. Government (see Acknowledgments.txt file).
// DM22-0790
// Contributed by Timothy A. Davis, Texas A&M University
//------------------------------------------------------------------------------
// LAGraph_Vector_Structure: return the structure of a vector as a boolean
// vector, where w(i)=true if the entry u(i) is present in the vector u.
#define LG_FREE_ALL GrB_free (w) ;
#include "LG_internal.h"
int LAGraph_Vector_Structure
(
// output:
GrB_Vector *w, // a boolean matrix with same structure of u, with w(i)
// set to true if u(i) appears in the sparsity structure
// of u.
// input:
GrB_Vector u,
char *msg
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
LG_CLEAR_MSG ;
GrB_Index n ;
LG_ASSERT_MSG (w != NULL, GrB_NULL_POINTER, "&w != NULL") ;
LG_ASSERT (u != NULL, GrB_NULL_POINTER) ;
(*w) = NULL ;
//--------------------------------------------------------------------------
// get the size of u
//--------------------------------------------------------------------------
GRB_TRY (GrB_Vector_size (&n, u)) ;
//--------------------------------------------------------------------------
// w<s(u)> = true
//--------------------------------------------------------------------------
GRB_TRY (GrB_Vector_new (w, GrB_BOOL, n)) ;
GRB_TRY (GrB_assign (*w, u, NULL, (bool) true, GrB_ALL, n, GrB_DESC_S)) ;
return (GrB_SUCCESS) ;
}