alpar@9: /* glprng.h (pseudo-random number generator) */
alpar@9: 
alpar@9: /***********************************************************************
alpar@9: *  This code is part of GLPK (GNU Linear Programming Kit).
alpar@9: *
alpar@9: *  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
alpar@9: *  2009, 2010, 2011 Andrew Makhorin, Department for Applied Informatics,
alpar@9: *  Moscow Aviation Institute, Moscow, Russia. All rights reserved.
alpar@9: *  E-mail: <mao@gnu.org>.
alpar@9: *
alpar@9: *  GLPK is free software: you can redistribute it and/or modify it
alpar@9: *  under the terms of the GNU General Public License as published by
alpar@9: *  the Free Software Foundation, either version 3 of the License, or
alpar@9: *  (at your option) any later version.
alpar@9: *
alpar@9: *  GLPK is distributed in the hope that it will be useful, but WITHOUT
alpar@9: *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
alpar@9: *  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
alpar@9: *  License for more details.
alpar@9: *
alpar@9: *  You should have received a copy of the GNU General Public License
alpar@9: *  along with GLPK. If not, see <http://www.gnu.org/licenses/>.
alpar@9: ***********************************************************************/
alpar@9: 
alpar@9: #ifndef GLPRNG_H
alpar@9: #define GLPRNG_H
alpar@9: 
alpar@9: typedef struct RNG RNG;
alpar@9: 
alpar@9: struct RNG
alpar@9: {     /* Knuth's portable pseudo-random number generator */
alpar@9:       int A[56];
alpar@9:       /* pseudo-random values */
alpar@9:       int *fptr;
alpar@9:       /* the next A value to be exported */
alpar@9: };
alpar@9: 
alpar@9: #define rng_create_rand _glp_rng_create_rand
alpar@9: RNG *rng_create_rand(void);
alpar@9: /* create pseudo-random number generator */
alpar@9: 
alpar@9: #define rng_init_rand _glp_rng_init_rand
alpar@9: void rng_init_rand(RNG *rand, int seed);
alpar@9: /* initialize pseudo-random number generator */
alpar@9: 
alpar@9: #define rng_next_rand _glp_rng_next_rand
alpar@9: int rng_next_rand(RNG *rand);
alpar@9: /* obtain pseudo-random integer in the range [0, 2^31-1] */
alpar@9: 
alpar@9: #define rng_unif_rand _glp_rng_unif_rand
alpar@9: int rng_unif_rand(RNG *rand, int m);
alpar@9: /* obtain pseudo-random integer in the range [0, m-1] */
alpar@9: 
alpar@9: #define rng_delete_rand _glp_rng_delete_rand
alpar@9: void rng_delete_rand(RNG *rand);
alpar@9: /* delete pseudo-random number generator */
alpar@9: 
alpar@9: #define rng_unif_01 _glp_rng_unif_01
alpar@9: double rng_unif_01(RNG *rand);
alpar@9: /* obtain pseudo-random number in the range [0, 1] */
alpar@9: 
alpar@9: #define rng_uniform _glp_rng_uniform
alpar@9: double rng_uniform(RNG *rand, double a, double b);
alpar@9: /* obtain pseudo-random number in the range [a, b] */
alpar@9: 
alpar@9: #endif
alpar@9: 
alpar@9: /* eof */