diff options
Diffstat (limited to 'numpy/random/mtrand/initarray.c')
| -rw-r--r-- | numpy/random/mtrand/initarray.c | 216 |
1 files changed, 115 insertions, 101 deletions
diff --git a/numpy/random/mtrand/initarray.c b/numpy/random/mtrand/initarray.c index 8e54a2c3f..9a559c045 100644 --- a/numpy/random/mtrand/initarray.c +++ b/numpy/random/mtrand/initarray.c @@ -1,75 +1,76 @@ -/* These function have been adapted from Python 2.4.1's _randommodule.c - - The following changes have been made to it in 2005 by Robert Kern: - - * init_by_array has been declared extern, has a void return, and uses the - rk_state structure to hold its data. - - The original file has the following verbatim comments: - - ------------------------------------------------------------------ - The code in this module was based on a download from: - http://www.math.keio.ac.jp/~matumoto/MT2002/emt19937ar.html - - It was modified in 2002 by Raymond Hettinger as follows: - - * the principal computational lines untouched except for tabbing. - - * renamed genrand_res53() to random_random() and wrapped - in python calling/return code. - - * genrand_int32() and the helper functions, init_genrand() - and init_by_array(), were declared static, wrapped in - Python calling/return code. also, their global data - references were replaced with structure references. - - * unused functions from the original were deleted. - new, original C python code was added to implement the - Random() interface. - - The following are the verbatim comments from the original code: - - A C-program for MT19937, with initialization improved 2002/1/26. - Coded by Takuji Nishimura and Makoto Matsumoto. - - Before using, initialize the state by using init_genrand(seed) - or init_by_array(init_key, key_length). - - Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, - All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - 1. Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - 2. Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the distribution. - - 3. The names of its contributors may not be used to endorse or promote - products derived from this software without specific prior written - permission. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - - Any feedback is very welcome. - http://www.math.keio.ac.jp/matumoto/emt.html - email: matumoto@math.keio.ac.jp -*/ +/* + * These function have been adapted from Python 2.4.1's _randommodule.c + * + * The following changes have been made to it in 2005 by Robert Kern: + * + * * init_by_array has been declared extern, has a void return, and uses the + * rk_state structure to hold its data. + * + * The original file has the following verbatim comments: + * + * ------------------------------------------------------------------ + * The code in this module was based on a download from: + * http://www.math.keio.ac.jp/~matumoto/MT2002/emt19937ar.html + * + * It was modified in 2002 by Raymond Hettinger as follows: + * + * * the principal computational lines untouched except for tabbing. + * + * * renamed genrand_res53() to random_random() and wrapped + * in python calling/return code. + * + * * genrand_int32() and the helper functions, init_genrand() + * and init_by_array(), were declared static, wrapped in + * Python calling/return code. also, their global data + * references were replaced with structure references. + * + * * unused functions from the original were deleted. + * new, original C python code was added to implement the + * Random() interface. + * + * The following are the verbatim comments from the original code: + * + * A C-program for MT19937, with initialization improved 2002/1/26. + * Coded by Takuji Nishimura and Makoto Matsumoto. + * + * Before using, initialize the state by using init_genrand(seed) + * or init_by_array(init_key, key_length). + * + * Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura, + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. The names of its contributors may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * + * Any feedback is very welcome. + * http://www.math.keio.ac.jp/matumoto/emt.html + * email: matumoto@math.keio.ac.jp + */ #include "initarray.h" @@ -81,56 +82,69 @@ static void init_genrand(rk_state *self, unsigned long s) { int mti; - unsigned long *mt; - - mt = self->key; - mt[0]= s & 0xffffffffUL; - for (mti=1; mti<RK_STATE_LEN; mti++) { - mt[mti] = - (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti); - /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */ - /* In the previous versions, MSBs of the seed affect */ - /* only MSBs of the array mt[]. */ - /* 2002/01/09 modified by Makoto Matsumoto */ + unsigned long *mt = self->key; + + mt[0] = s & 0xffffffffUL; + for (mti = 1; mti < RK_STATE_LEN; mti++) { + /* + * See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. + * In the previous versions, MSBs of the seed affect + * only MSBs of the array mt[]. + * 2002/01/09 modified by Makoto Matsumoto + */ + mt[mti] = (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti); + /* for > 32 bit machines */ mt[mti] &= 0xffffffffUL; - /* for >32 bit machines */ } self->pos = mti; return; } -/* initialize by an array with array-length */ -/* init_key is the array for initializing keys */ -/* key_length is its length */ +/* + * initialize by an array with array-length + * init_key is the array for initializing keys + * key_length is its length + */ extern void init_by_array(rk_state *self, unsigned long init_key[], unsigned long key_length) { - unsigned int i, j, k; /* was signed in the original code. RDH 12/16/2002 */ - unsigned long *mt; + /* was signed in the original code. RDH 12/16/2002 */ + unsigned int i = 1; + unsigned int j = 0; + unsigned long *mt = self->key; + unsigned int k; - mt = self->key; init_genrand(self, 19650218UL); - i=1; j=0; - k = (RK_STATE_LEN>key_length ? RK_STATE_LEN : key_length); + k = (RK_STATE_LEN > key_length ? RK_STATE_LEN : key_length); for (; k; k--) { - mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL)) - + init_key[j] + j; /* non linear */ - mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */ - i++; j++; - if (i>=RK_STATE_LEN) { mt[0] = mt[RK_STATE_LEN-1]; i=1; } - if (j>=key_length) j=0; + /* non linear */ + mt[i] = (mt[i] ^ ((mt[i - 1] ^ (mt[i - 1] >> 30)) * 1664525UL)) + + init_key[j] + j; + /* for > 32 bit machines */ + mt[i] &= 0xffffffffUL; + i++; + j++; + if (i >= RK_STATE_LEN) { + mt[0] = mt[RK_STATE_LEN - 1]; + i = 1; + } + if (j >= key_length) { + j = 0; + } } - for (k=RK_STATE_LEN-1; k; k--) { + for (k = RK_STATE_LEN - 1; k; k--) { mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL)) - i; /* non linear */ mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */ i++; - if (i>=RK_STATE_LEN) { mt[0] = mt[RK_STATE_LEN-1]; i=1; } + if (i >= RK_STATE_LEN) { + mt[0] = mt[RK_STATE_LEN - 1]; + i = 1; + } } mt[0] = 0x80000000UL; /* MSB is 1; assuring non-zero initial array */ self->has_gauss = 0; self->has_binomial = 0; } - |