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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
#ifdef TARGETPYTHON
#include "Python.h"
#endif
#ifndef TARGETPYTHON
#define STRICT_R_HEADERS
#include <stdio.h>
#include <stdlib.h>
#include <R.h>
#include <Rinternals.h>
#endif
int lfsr113(int **state)
{
unsigned long z1, z2, z3, z4, b;
z1 = (*state)[0];
z2 = (*state)[1];
z3 = (*state)[2];
z4 = (*state)[3];
b = (((z1 << 6) ^ z1) >> 13);
z1 = (((z1 & 4294967294) << 18) ^ b);
b = (((z2 << 2) ^ z2) >> 27);
z2 = (((z2 & 4294967288) << 2) ^ b);
b = (((z3 << 13) ^ z3) >> 21);
z3 = (((z3 & 4294967280) << 7) ^ b);
b = (((z4 << 3) ^ z4) >> 12);
z4 = (((z4 & 4294967168) << 13) ^ b);
b = (z1 ^ z2 ^ z3 ^ z4);
(*state)[0] = z1 & 0x7FFFFFFF;
(*state)[1] = z2 & 0x7FFFFFFF;
(*state)[2] = z3 & 0x7FFFFFFF;
(*state)[3] = z4 & 0x7FFFFFFF;
b = b & 0x7FFFFFFF;
return(b);
}
void lfsr113_seed(unsigned long seed, int **state)
{
unsigned long z1 = 2,
z2 = 8,
z3 = 16,
z4 = 128;
z1 = (z1 * (seed + 1)) & 0x7FFFFFFF;
z2 = (z2 * (seed + 1)) & 0x7FFFFFFF;
z3 = (z3 * (seed + 1)) & 0x7FFFFFFF;
z4 = (z4 * (seed + 1)) & 0x7FFFFFFF;
if (*state == NULL) {
(*state) = malloc(sizeof(int)*4);
}
(*state)[0] = (int) z1;
(*state)[1] = (int) z2;
(*state)[2] = (int) z3;
(*state)[3] = (int) z4;
}
#ifdef TARGETPYTHON
/*
*
* Start of Python code
*
*/
static char module_docstring[] =
"This module provides the Tausworthe RNG for R and Python simultaneously";
static PyObject *taus_seed(PyObject *self, PyObject *args)
{
int seed, *state = NULL;
if (!PyArg_ParseTuple(args, "i", &seed))
return NULL;
lfsr113_seed(seed, &state);
PyObject *pystate = Py_BuildValue("[i, i, i, i]",
state[0], state[1], state[2], state[3]);
free(state);
return pystate;
}
static PyObject *taus_rand(PyObject *self, PyObject *args)
{
int i, value, numints, *localstate;
PyObject *listObj;
PyObject *intObj;
if (!PyArg_ParseTuple(args, "O!", &PyList_Type, &listObj))
return NULL;
// we're just assuming you would never pass more than 4 values
localstate = malloc(sizeof(int)*5);
numints = PyList_Size(listObj);
for (i=0; i<numints; i++) {
intObj = PyList_GetItem(listObj, i);
value = (int) PyLong_AsLong(intObj);
localstate[i] = value;
}
int rand = lfsr113(&localstate);
localstate[4] = rand;
PyObject *pystate = Py_BuildValue("[i, i, i, i, i]",
localstate[0], localstate[1], localstate[2],
localstate[3], rand);
free(localstate);
return pystate;
}
static PyMethodDef TausMethods[] = {
{"seed", taus_seed, METH_VARARGS,
"Seed the Tausworthe RNG."},
{"rand", taus_rand, METH_VARARGS,
"Generate a single random integer."},
{NULL, NULL, 0, NULL}
};
PyMODINIT_FUNC inittaus(void)
{
PyObject *m = Py_InitModule3("taus", TausMethods, module_docstring);
if (m == NULL)
return;
}
#endif
#ifndef TARGETPYTHON
/*
*
* Start of R code
*
*/
SEXP R_tausworthe_seed(SEXP seed)
{
int i, *pstate = NULL, *state = NULL;
int *pseed = INTEGER(seed);
SEXP Rstate = PROTECT(allocVector(INTSXP, 5));
pstate = INTEGER(Rstate);
lfsr113_seed(*pseed, &state);
for (i=0; i<4; i++) {
pstate[i] = state[i];
}
pstate[4] = -1;
free(state);
UNPROTECT(1);
return Rstate;
}
SEXP R_tausworthe_rand(SEXP state)
{
int *localstate = malloc(sizeof(int)*4);
int *pstate = INTEGER(state);
int i;
for (i=0; i<4; i++)
localstate[i] = pstate[i];
int rand = lfsr113(&localstate);
SEXP Rstate = PROTECT(allocVector(INTSXP, 5));
pstate = INTEGER(Rstate);
for (i=0; i<4; i++)
pstate[i] = localstate[i];
pstate[4] = rand;
UNPROTECT(1);
free(localstate);
return Rstate;
}
/*
*
* End of R code
*
*/
#endif
|
