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- /* rng/transputer.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 James Theiler, Brian Gough
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- #include "gsl__config.h"
- #include <stdlib.h>
- #include "gsl_rng.h"
- /* This is the INMOS Transputer Development System generator. The sequence is,
- x_{n+1} = (a x_n) mod m
- with a = 1664525 and m = 2^32. The seed specifies the initial
- value, x_1.
- The theoretical value of x_{10001} is 1244127297.
- The period of this generator is 2^30. */
- static inline unsigned long int transputer_get (void *vstate);
- static double transputer_get_double (void *vstate);
- static void transputer_set (void *state, unsigned long int s);
- typedef struct
- {
- unsigned long int x;
- }
- transputer_state_t;
- static unsigned long int
- transputer_get (void *vstate)
- {
- transputer_state_t *state = (transputer_state_t *) vstate;
- state->x = (1664525 * state->x) & 0xffffffffUL;
- return state->x;
- }
- static double
- transputer_get_double (void *vstate)
- {
- return transputer_get (vstate) / 4294967296.0 ;
- }
- static void
- transputer_set (void *vstate, unsigned long int s)
- {
- transputer_state_t *state = (transputer_state_t *) vstate;
- if (s == 0)
- s = 1 ; /* default seed is 1. */
- state->x = s;
- return;
- }
- static const gsl_rng_type transputer_type =
- {"transputer", /* name */
- 0xffffffffUL, /* RAND_MAX */
- 1, /* RAND_MIN */
- sizeof (transputer_state_t),
- &transputer_set,
- &transputer_get,
- &transputer_get_double};
- const gsl_rng_type *gsl_rng_transputer = &transputer_type;
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