160 lines
4.3 KiB
C++
160 lines
4.3 KiB
C++
#include "random.h"
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#include "utils.h"
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/* Period parameters */
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#define M 397
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#define MATRIX_A 0x9908b0dfUL /* constant vector a */
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#define UPPER_MASK 0x80000000UL /* most significant w-r bits */
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#define LOWER_MASK 0x7fffffffUL /* least significant r bits */
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Random::Random()
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{
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mti = RAND_N+1; /* mti==RAND_N+1 means mt[RAND_N] is not initialized */
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struct timeval tv;
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gettimeofday(&tv);
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unsigned long long int s = tv.tv_sec * 1000000 + tv.tv_usec;
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initLong(s);
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}
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Random::Random(unsigned long int seed)
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{
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mti = RAND_N+1; /* mti==RAND_N+1 means mt[RAND_N] is not initialized */
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initLong(seed);
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}
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/* initialize by an array with array-length */
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/* init_key is the array for initializing keys */
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/* key_length is its length */
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Random::Random(int init_key[], int key_length)
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{
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mti = RAND_N+1; /* mti==RAND_N+1 means mt[RAND_N] is not initialized */
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int i, j, k;
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initLong(19650218UL);
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i=1; j=0;
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k = (RAND_N>key_length ? RAND_N : key_length);
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for (; k; k--) {
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mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL))
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+ init_key[j] + j; /* non linear */
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mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
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i++; j++;
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if (i>=RAND_N) { mt[0] = mt[RAND_N-1]; i=1; }
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if (j>=key_length) j=0;
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}
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for (k=RAND_N-1; k; k--) {
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mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL))
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- i; /* non linear */
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mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
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i++;
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if (i>=RAND_N) { mt[0] = mt[RAND_N-1]; i=1; }
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}
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mt[0] = 0x80000000UL; /* MSB is 1; assuring non-zero initial array */
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}
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Random::~Random()
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{
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}
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/* initializes mt[RAND_N] with a seed */
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void Random::initLong(unsigned long s)
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{
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mt[0]= s & 0xffffffffUL;
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for (mti=1; mti<RAND_N; mti++) {
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mt[mti] =
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(1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti);
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/* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
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/* In the previous versions, MSBs of the seed affect */
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/* only MSBs of the array mt[]. */
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/* 2002/01/09 modified by Makoto Matsumoto */
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mt[mti] &= 0xffffffffUL;
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/* for >32 bit machines */
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}
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}
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/* generates a random number on [0,0xffffffff]-interval */
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unsigned long Random::genInt32(void)
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{
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unsigned long y;
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static unsigned long mag01[2]={0x0UL, MATRIX_A};
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/* mag01[x] = x * MATRIX_A for x=0,1 */
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if (mti >= RAND_N) { /* generate N words at one time */
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int kk;
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if (mti == RAND_N+1) /* if init_genrand() has not been called, */
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initLong(5489UL); /* a default initial seed is used */
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for (kk=0;kk<RAND_N-M;kk++) {
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y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
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mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
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}
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for (;kk<RAND_N-1;kk++) {
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y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
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mt[kk] = mt[kk+(M-RAND_N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
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}
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y = (mt[RAND_N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
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mt[RAND_N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
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mti = 0;
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}
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y = mt[mti++];
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/* Tempering */
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y ^= (y >> 11);
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y ^= (y << 7) & 0x9d2c5680UL;
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y ^= (y << 15) & 0xefc60000UL;
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y ^= (y >> 18);
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return y;
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}
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/* generates a random number on [0,0x7fffffff]-interval */
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long Random::genInt31()
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{
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return (long)(genInt32()>>1);
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}
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/* generates a random number on [0,1]-real-interval */
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double Random::genReal1(void)
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{
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return genInt32()*(1.0/4294967295.0);
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/* divided by 2^32-1 */
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}
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/* generates a random number on [0,1)-real-interval */
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double Random::genReal2()
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{
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return genInt32()*(1.0/4294967296.0);
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/* divided by 2^32 */
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}
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/* generates a random number on (0,1)-real-interval */
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double Random::genReal3(void)
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{
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return (((double)genInt32()) + 0.5)*(1.0/4294967296.0);
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/* divided by 2^32 */
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}
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/* generates a random number on [0,1) with 53-bit resolution*/
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double Random::genReal53(void)
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{
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unsigned long a=genInt32()>>5, b=genInt32()>>6;
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return(a*67108864.0+b)*(1.0/9007199254740992.0);
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}
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/* generate integer random number on [0, range) int interval */
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int Random::genInt(int range)
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{
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int v = (int)(genReal2() * range);
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if (v == range) printf("ooops!\n");
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return v;
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}
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