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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
//------------------------------------------------------------------------------
// COLAMD/MATLAB/symamdmex.c: MATLAB interface for SYMAMD
//------------------------------------------------------------------------------
// COLAMD, Copyright (c) 1998-2022, Timothy A. Davis and Stefan Larimore,
// All Rights Reserved.
// SPDX-License-Identifier: BSD-3-clause
//------------------------------------------------------------------------------
/* SYMAMD mexFunction
Usage:
P = symamd2 (A) ;
[ P, stats ] = symamd2 (A, knobs) ;
See symamd.m for a description.
Authors:
The authors of the code itself are Stefan I. Larimore and Timothy A.
Davis (DrTimothyAldenDavis@gmail.com). The algorithm was
developed in collaboration with John Gilbert, Xerox PARC, and Esmond
Ng, Oak Ridge National Laboratory.
Acknowledgements:
This work was supported by the National Science Foundation, under
grants DMS-9504974 and DMS-9803599.
Availability:
The colamd/symamd library is available at http://www.suitesparse.com
*/
/* ========================================================================== */
/* === Include files ======================================================== */
/* ========================================================================== */
#include "colamd.h"
#include "mex.h"
#include "matrix.h"
#include <stdlib.h>
/* ========================================================================== */
/* === symamd mexFunction =================================================== */
/* ========================================================================== */
void mexFunction
(
/* === Parameters ======================================================= */
int nlhs, /* number of left-hand sides */
mxArray *plhs [], /* left-hand side matrices */
int nrhs, /* number of right--hand sides */
const mxArray *prhs [] /* right-hand side matrices */
)
{
/* === Local variables ================================================== */
int64_t *perm ; /* column ordering of M and ordering of A */
int64_t *A ; /* row indices of input matrix A */
int64_t *p ; /* column pointers of input matrix A */
int64_t n_col ; /* number of columns of A */
int64_t n_row ; /* number of rows of A */
int full ; /* TRUE if input matrix full, FALSE if sparse */
double knobs [COLAMD_KNOBS] ; /* colamd user-controllable parameters */
double *out_perm ; /* output permutation vector */
double *out_stats ; /* output stats vector */
double *in_knobs ; /* input knobs vector */
int64_t i ; /* loop counter */
mxArray *Ainput ; /* input matrix handle */
int spumoni ; /* verbosity variable */
int64_t stats [COLAMD_STATS] ; /* stats for symamd */
/* === Check inputs ===================================================== */
if (nrhs < 1 || nrhs > 2 || nlhs < 0 || nlhs > 2)
{
mexErrMsgTxt (
"symamd: incorrect number of input and/or output arguments.") ;
}
/* === Get knobs ======================================================== */
colamd_l_set_defaults (knobs) ;
spumoni = 0 ;
/* check for user-passed knobs */
if (nrhs == 2)
{
in_knobs = mxGetPr (prhs [1]) ;
i = mxGetNumberOfElements (prhs [1]) ;
if (i > 0) knobs [COLAMD_DENSE_ROW] = in_knobs [0] ;
if (i > 1) spumoni = (int) (in_knobs [1] != 0) ;
}
/* print knob settings if spumoni is set */
if (spumoni)
{
mexPrintf ("\nsymamd version %d.%d, %s:\n",
COLAMD_MAIN_VERSION, COLAMD_SUB_VERSION, COLAMD_DATE) ;
if (knobs [COLAMD_DENSE_ROW] >= 0)
{
mexPrintf ("knobs(1): %g, rows/cols with > "
"max(16,%g*sqrt(size(A,2))) entries removed\n",
in_knobs [0], knobs [COLAMD_DENSE_ROW]) ;
}
else
{
mexPrintf ("knobs(1): %g, no dense rows removed\n", in_knobs [0]) ;
}
mexPrintf ("knobs(2): %g, statistics and knobs printed\n",
in_knobs [1]) ;
}
/* === If A is full, convert to a sparse matrix ========================= */
Ainput = (mxArray *) prhs [0] ;
if (mxGetNumberOfDimensions (Ainput) != 2)
{
mexErrMsgTxt ("symamd: input matrix must be 2-dimensional.") ;
}
full = !mxIsSparse (Ainput) ;
if (full)
{
mexCallMATLAB (1, &Ainput, 1, (mxArray **) prhs, "sparse") ;
}
/* === Allocate workspace for symamd ==================================== */
/* get size of matrix */
n_row = mxGetM (Ainput) ;
n_col = mxGetN (Ainput) ;
if (n_col != n_row)
{
mexErrMsgTxt ("symamd: matrix must be square.") ;
}
A = (int64_t *) mxGetIr (Ainput) ;
p = (int64_t *) mxGetJc (Ainput) ;
perm = (int64_t *) mxCalloc (n_col+1, sizeof (int64_t)) ;
/* === Order the rows and columns of A (does not destroy A) ============= */
if (!symamd_l (n_col, A, p, perm, knobs, stats, &mxCalloc, &mxFree))
{
symamd_l_report (stats) ;
mexErrMsgTxt ("symamd error!") ;
}
if (full)
{
mxDestroyArray (Ainput) ;
}
/* === Return the permutation vector ==================================== */
plhs [0] = mxCreateDoubleMatrix (1, n_col, mxREAL) ;
out_perm = mxGetPr (plhs [0]) ;
for (i = 0 ; i < n_col ; i++)
{
/* symamd is 0-based, but MATLAB expects this to be 1-based */
out_perm [i] = perm [i] + 1 ;
}
mxFree (perm) ;
/* === Return the stats vector ========================================== */
/* print stats if spumoni is set */
if (spumoni)
{
symamd_l_report (stats) ;
}
if (nlhs == 2)
{
plhs [1] = mxCreateDoubleMatrix (1, COLAMD_STATS, mxREAL) ;
out_stats = mxGetPr (plhs [1]) ;
for (i = 0 ; i < COLAMD_STATS ; i++)
{
out_stats [i] = stats [i] ;
}
/* fix stats (5) and (6), for 1-based information on jumbled matrix. */
/* note that this correction doesn't occur if symamd returns FALSE */
out_stats [COLAMD_INFO1] ++ ;
out_stats [COLAMD_INFO2] ++ ;
}
}
|
