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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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