[9] | 1 | /* glprng.h (pseudo-random number generator) */ |
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| 2 | |
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| 3 | /*********************************************************************** |
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| 4 | * This code is part of GLPK (GNU Linear Programming Kit). |
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| 5 | * |
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| 6 | * Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
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| 7 | * 2009, 2010, 2011 Andrew Makhorin, Department for Applied Informatics, |
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| 8 | * Moscow Aviation Institute, Moscow, Russia. All rights reserved. |
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| 9 | * E-mail: <mao@gnu.org>. |
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| 10 | * |
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| 11 | * GLPK is free software: you can redistribute it and/or modify it |
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| 12 | * under the terms of the GNU General Public License as published by |
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| 13 | * the Free Software Foundation, either version 3 of the License, or |
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| 14 | * (at your option) any later version. |
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| 15 | * |
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| 16 | * GLPK is distributed in the hope that it will be useful, but WITHOUT |
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| 17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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| 18 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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| 19 | * License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with GLPK. If not, see <http://www.gnu.org/licenses/>. |
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| 23 | ***********************************************************************/ |
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| 24 | |
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| 25 | #ifndef GLPRNG_H |
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| 26 | #define GLPRNG_H |
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| 27 | |
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| 28 | typedef struct RNG RNG; |
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| 29 | |
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| 30 | struct RNG |
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| 31 | { /* Knuth's portable pseudo-random number generator */ |
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| 32 | int A[56]; |
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| 33 | /* pseudo-random values */ |
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| 34 | int *fptr; |
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| 35 | /* the next A value to be exported */ |
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| 36 | }; |
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| 37 | |
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| 38 | #define rng_create_rand _glp_rng_create_rand |
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| 39 | RNG *rng_create_rand(void); |
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| 40 | /* create pseudo-random number generator */ |
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| 41 | |
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| 42 | #define rng_init_rand _glp_rng_init_rand |
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| 43 | void rng_init_rand(RNG *rand, int seed); |
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| 44 | /* initialize pseudo-random number generator */ |
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| 45 | |
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| 46 | #define rng_next_rand _glp_rng_next_rand |
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| 47 | int rng_next_rand(RNG *rand); |
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| 48 | /* obtain pseudo-random integer in the range [0, 2^31-1] */ |
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| 49 | |
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| 50 | #define rng_unif_rand _glp_rng_unif_rand |
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| 51 | int rng_unif_rand(RNG *rand, int m); |
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| 52 | /* obtain pseudo-random integer in the range [0, m-1] */ |
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| 53 | |
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| 54 | #define rng_delete_rand _glp_rng_delete_rand |
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| 55 | void rng_delete_rand(RNG *rand); |
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| 56 | /* delete pseudo-random number generator */ |
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| 57 | |
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| 58 | #define rng_unif_01 _glp_rng_unif_01 |
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| 59 | double rng_unif_01(RNG *rand); |
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| 60 | /* obtain pseudo-random number in the range [0, 1] */ |
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| 61 | |
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| 62 | #define rng_uniform _glp_rng_uniform |
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| 63 | double rng_uniform(RNG *rand, double a, double b); |
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| 64 | /* obtain pseudo-random number in the range [a, b] */ |
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| 65 | |
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| 66 | #endif |
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| 67 | |
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| 68 | /* eof */ |
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