1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/* 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 <config.h>
#include <stdlib.h>
#include <gsl/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;
|
