src/common/rand.cc

#include <stdlib.h>
#include <math.h>

#include "rand.h"

unsigned long IBM;
long cur_rand;
unsigned long rand_history[1280];


void sgenrand(unsigned long seed);      
double genrand();


void my_srand(long seed) {
  int i;
  srand(seed);
  IBM = seed;
  for (i = 0; i < 1280; i++) {
    rand_history[i] = rand() * rand();
  }
  sgenrand(seed);
  cur_rand = 0; 
}

//this is the IBM random number generator reimplmented in C, as I under stand it
double my_rand1(void) {
  IBM = IBM * 65549;
//don't need the addition step because am using unsigned integers
//      if (IBM < 0) {
//              IBM = IBM + 2147483647 + 1;
//      }
//2.3e-10 is 1/2^32
  return  2.328306436538696e-10 * (double)IBM;
}

//my tausworth random number generator
double my_rand2(void) {
  cur_rand--;
  if (cur_rand < 0)
    cur_rand += 1280;
  rand_history[cur_rand] = rand_history[ (cur_rand + 1279) % 1280 ] ^ rand_history[ (cur_rand + 418) % 1280] ;
  //  return 2.328306436538696e-10 * (double)rand_history[cur_rand];
  return (double)rand_history[cur_rand] / 4294967295.0;
}


double my_rand3(void) {
  return genrand();
}

double my_rand4(void) {
  return (double)rand() / RAND_MAX;
}




//GPL code for the MT19937 random number generator
//this can be removed if open source code is not allowed in
//the HW

/* A C-program for MT19937: Real number version([0,1)-interval) */
/* (1999/10/28)                                                 */
/*   genrand() generates one pseudorandom real number (double)  */
/* which is uniformly distributed on [0,1)-interval, for each   */
/* call. sgenrand(seed) sets initial values to the working area */
/* of 624 words. Before genrand(), sgenrand(seed) must be       */
/* called once. (seed is any 32-bit integer.)                   */
/* Integer generator is obtained by modifying two lines.        */
/*   Coded by Takuji Nishimura, considering the suggestions by  */
/* Topher Cooper and Marc Rieffel in July-Aug. 1997.            */

/* This library is free software; you can redistribute it and/or   */
/* modify it under the terms of the GNU Library General Public     */
/* License as published by the Free Software Foundation; either    */
/* version 2 of the License, or (at your option) any later         */
/* version.                                                        */
/* This library 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 Library General Public License for more details.    */
/* You should have received a copy of the GNU Library General      */
/* Public License along with this library; if not, write to the    */
/* Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   */ 
/* 02111-1307  USA                                                 */

/* Copyright (C) 1997, 1999 Makoto Matsumoto and Takuji Nishimura. */
/* Any feedback is very welcome. For any question, comments,       */
/* see http://www.math.keio.ac.jp/matumoto/emt.html or email       */
/* matumoto@math.keio.ac.jp                                        */

/* REFERENCE                                                       */
/* M. Matsumoto and T. Nishimura,                                  */
/* "Mersenne Twister: A 623-Dimensionally Equidistributed Uniform  */
/* Pseudo-Random Number Generator",                                */
/* ACM Transactions on Modeling and Computer Simulation,           */
/* Vol. 8, No. 1, January 1998, pp 3--30.                          */

#include<stdio.h>

/* Period parameters */  
#define N 624
#define M 397
#define MATRIX_A 0x9908b0df   /* constant vector a */
#define UPPER_MASK 0x80000000 /* most significant w-r bits */
#define LOWER_MASK 0x7fffffff /* least significant r bits */

/* Tempering parameters */   
#define TEMPERING_MASK_B 0x9d2c5680
#define TEMPERING_MASK_C 0xefc60000
#define TEMPERING_SHIFT_U(y)  (y >> 11)
#define TEMPERING_SHIFT_S(y)  (y << 7)
#define TEMPERING_SHIFT_T(y)  (y << 15)
#define TEMPERING_SHIFT_L(y)  (y >> 18)

static unsigned long mt[N]; /* the array for the state vector  */
static int mti=N+1; /* mti==N+1 means mt[N] is not initialized */

/* Initializing the array with a seed */
void
sgenrand(unsigned long seed) {
    int i;

    for (i=0;i<N;i++) {
         mt[i] = seed & 0xffff0000;
         seed = 69069 * seed + 1;
         mt[i] |= (seed & 0xffff0000) >> 16;
         seed = 69069 * seed + 1;
    }
    mti = N;
}

/* Initialization by "sgenrand()" is an example. Theoretically,      */
/* there are 2^19937-1 possible states as an intial state.           */
/* This function allows to choose any of 2^19937-1 ones.             */
/* Essential bits in "seed_array[]" is following 19937 bits:         */
/*  (seed_array[0]&UPPER_MASK), seed_array[1], ..., seed_array[N-1]. */
/* (seed_array[0]&LOWER_MASK) is discarded.                          */ 
/* Theoretically,                                                    */
/*  (seed_array[0]&UPPER_MASK), seed_array[1], ..., seed_array[N-1]  */
/* can take any values except all zeros.                             */
void
lsgenrand(unsigned long seed_array[])

    /* the length of seed_array[] must be at least N */
{
    int i;

    for (i=0;i<N;i++) 
      mt[i] = seed_array[i];
    mti=N;
}

double /* generating reals */
/* unsigned long */ /* for integer generation */
genrand()
{
    unsigned long y;
    static unsigned long mag01[2]={0x0, MATRIX_A};
    /* mag01[x] = x * MATRIX_A  for x=0,1 */

    if (mti >= N) { /* generate N words at one time */
        int kk;

        if (mti == N+1)   /* if sgenrand() has not been called, */
            sgenrand(4357); /* a default initial seed is used   */

        for (kk=0;kk<N-M;kk++) {
            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
            mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1];
        }
        for (;kk<N-1;kk++) {
            y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
            mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1];
        }
        y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
        mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1];

        mti = 0;
    }
  
    y = mt[mti++];
    y ^= TEMPERING_SHIFT_U(y);
    y ^= TEMPERING_SHIFT_S(y) & TEMPERING_MASK_B;
    y ^= TEMPERING_SHIFT_T(y) & TEMPERING_MASK_C;
    y ^= TEMPERING_SHIFT_L(y);

    return ( (double)y * 2.3283064365386963e-10 ); /* reals: [0,1)-interval */
    /* return y; */ /* for integer generation */
}

---