|
1 /* glprng.h (pseudo-random number generator) */ |
|
2 |
|
3 /*********************************************************************** |
|
4 * This code is part of GLPK (GNU Linear Programming Kit). |
|
5 * |
|
6 * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
|
7 * 2009, 2010 Andrew Makhorin, Department for Applied Informatics, |
|
8 * Moscow Aviation Institute, Moscow, Russia. All rights reserved. |
|
9 * E-mail: <mao@gnu.org>. |
|
10 * |
|
11 * GLPK is free software: you can redistribute it and/or modify it |
|
12 * under the terms of the GNU General Public License as published by |
|
13 * the Free Software Foundation, either version 3 of the License, or |
|
14 * (at your option) any later version. |
|
15 * |
|
16 * GLPK is distributed in the hope that it will be useful, but WITHOUT |
|
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
|
18 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
|
19 * License for more details. |
|
20 * |
|
21 * You should have received a copy of the GNU General Public License |
|
22 * along with GLPK. If not, see <http://www.gnu.org/licenses/>. |
|
23 ***********************************************************************/ |
|
24 |
|
25 #ifndef GLPRNG_H |
|
26 #define GLPRNG_H |
|
27 |
|
28 typedef struct RNG RNG; |
|
29 |
|
30 struct RNG |
|
31 { /* Knuth's portable pseudo-random number generator */ |
|
32 int A[56]; |
|
33 /* pseudo-random values */ |
|
34 int *fptr; |
|
35 /* the next A value to be exported */ |
|
36 }; |
|
37 |
|
38 #define rng_create_rand _glp_rng_create_rand |
|
39 RNG *rng_create_rand(void); |
|
40 /* create pseudo-random number generator */ |
|
41 |
|
42 #define rng_init_rand _glp_rng_init_rand |
|
43 void rng_init_rand(RNG *rand, int seed); |
|
44 /* initialize pseudo-random number generator */ |
|
45 |
|
46 #define rng_next_rand _glp_rng_next_rand |
|
47 int rng_next_rand(RNG *rand); |
|
48 /* obtain pseudo-random integer in the range [0, 2^31-1] */ |
|
49 |
|
50 #define rng_unif_rand _glp_rng_unif_rand |
|
51 int rng_unif_rand(RNG *rand, int m); |
|
52 /* obtain pseudo-random integer in the range [0, m-1] */ |
|
53 |
|
54 #define rng_delete_rand _glp_rng_delete_rand |
|
55 void rng_delete_rand(RNG *rand); |
|
56 /* delete pseudo-random number generator */ |
|
57 |
|
58 #define rng_unif_01 _glp_rng_unif_01 |
|
59 double rng_unif_01(RNG *rand); |
|
60 /* obtain pseudo-random number in the range [0, 1] */ |
|
61 |
|
62 #define rng_uniform _glp_rng_uniform |
|
63 double rng_uniform(RNG *rand, double a, double b); |
|
64 /* obtain pseudo-random number in the range [a, b] */ |
|
65 |
|
66 #endif |
|
67 |
|
68 /* eof */ |