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/* rng/lecuyer21.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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* This generator is taken from
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*
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* Donald E. Knuth
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* The Art of Computer Programming
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* Volume 2
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* Third Edition
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* Addison-Wesley
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* Page 108
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*
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* This implementation copyright (C) 2001 Brian Gough, Carlo Perassi
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* and (C) 2003 Heiko Bauke.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <gsl/gsl_rng.h>
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#define AAA 40692
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#define MMM 2147483399UL
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#define QQQ 52774
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#define RRR 3791
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static inline unsigned long int ran_get (void *vstate);
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static double ran_get_double (void *vstate);
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static void ran_set (void *state, unsigned long int s);
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typedef struct
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{
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unsigned long int x;
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}
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ran_state_t;
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static inline unsigned long int
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ran_get (void *vstate)
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{
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ran_state_t *state = (ran_state_t *) vstate;
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long int y = state->x;
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long int r = RRR * (y / QQQ);
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y = AAA * (y % QQQ) - r;
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if (y < 0)
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y += MMM;
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state->x = y;
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return state->x;
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}
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static double
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ran_get_double (void *vstate)
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{
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ran_state_t *state = (ran_state_t *) vstate;
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return ran_get (state) / 2147483399.0;
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}
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static void
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ran_set (void *vstate, unsigned long int s)
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{
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ran_state_t *state = (ran_state_t *) vstate;
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if ((s%MMM) == 0)
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s = 1; /* default seed is 1 */
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state->x = s % MMM;
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return;
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}
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static const gsl_rng_type ran_type = {
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"lecuyer21", /* name */
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MMM-1, /* RAND_MAX */
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1, /* RAND_MIN */
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sizeof (ran_state_t),
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&ran_set,
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&ran_get,
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&ran_get_double
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};
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const gsl_rng_type *gsl_rng_lecuyer21 = &ran_type;
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