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00021 #include "random.h"
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00066 #include <stdio.h>
00067
00068
00069 #define N 624
00070 #define M 397
00071 #define MATRIX_A 0x9908b0dfUL
00072 #define UPPER_MASK 0x80000000UL
00073 #define LOWER_MASK 0x7fffffffUL
00074
00075 static unsigned long mt[N];
00076 static int mti=N+1;
00077
00078
00079
00084 VL_EXPORT
00085 void vl_rand_get_state (vl_uint32 state [625])
00086 {
00087 int k ;
00088 for (k = 0 ; k < 624 ; ++k) state [k] = mt [k] ;
00089 state [k] = mti ;
00090 }
00091
00096 VL_EXPORT
00097 void vl_rand_set_state (vl_uint32 const state [625])
00098 {
00099 int k ;
00100 for (k = 0 ; k < 624 ; ++k) mt [k] = state [k] ;
00101 mti = VL_MIN (state [624], 624) ;
00102 }
00103
00109 VL_EXPORT
00110 void vl_rand_seed (vl_uint32 s)
00111 {
00112 mt[0]= s & 0xffffffffUL;
00113 for (mti=1; mti<N; mti++) {
00114 mt[mti] =
00115 (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti);
00116
00117
00118
00119
00120 mt[mti] &= 0xffffffffUL;
00121
00122 }
00123 }
00124
00131 VL_EXPORT
00132 void vl_rand_seed_by_array (vl_uint32 const init_key [], int key_length)
00133 {
00134 int i, j, k;
00135 vl_rand_seed (19650218UL);
00136 i=1; j=0;
00137 k = (N>key_length ? N : key_length);
00138 for (; k; k--) {
00139 mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL))
00140 + init_key[j] + j;
00141 mt[i] &= 0xffffffffUL;
00142 i++; j++;
00143 if (i>=N) { mt[0] = mt[N-1]; i=1; }
00144 if (j>=key_length) j=0;
00145 }
00146 for (k=N-1; k; k--) {
00147 mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL))
00148 - i;
00149 mt[i] &= 0xffffffffUL;
00150 i++;
00151 if (i>=N) { mt[0] = mt[N-1]; i=1; }
00152 }
00153
00154 mt[0] = 0x80000000UL;
00155 }
00156
00161 VL_EXPORT
00162 vl_uint32 vl_rand_uint32 ()
00163 {
00164 unsigned long y;
00165 static unsigned long mag01[2]={0x0UL, MATRIX_A};
00166
00167
00168 if (mti >= N) {
00169 int kk;
00170
00171 if (mti == N+1)
00172 vl_rand_seed (5489UL);
00173
00174 for (kk=0;kk<N-M;kk++) {
00175 y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
00176 mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
00177 }
00178 for (;kk<N-1;kk++) {
00179 y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
00180 mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
00181 }
00182 y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
00183 mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
00184
00185 mti = 0;
00186 }
00187
00188 y = mt[mti++];
00189
00190
00191 y ^= (y >> 11);
00192 y ^= (y << 7) & 0x9d2c5680UL;
00193 y ^= (y << 15) & 0xefc60000UL;
00194 y ^= (y >> 18);
00195
00196 return y;
00197 }
00198
00203 VL_EXPORT
00204 vl_int32 vl_rand_int31 ()
00205 {
00206 return (vl_int32)(vl_rand_uint32()>>1);
00207 }
00208
00213 VL_EXPORT
00214 double vl_rand_real1 ()
00215 {
00216 return vl_rand_uint32()*(1.0/4294967295.0);
00217
00218 }
00219
00224 VL_EXPORT
00225 double vl_rand_real2 ()
00226 {
00227 return vl_rand_uint32()*(1.0/4294967296.0);
00228
00229 }
00230
00235 VL_EXPORT
00236 double vl_rand_real3 ()
00237 {
00238 return (((double)vl_rand_uint32()) + 0.5)*(1.0/4294967296.0);
00239
00240 }
00241
00246 VL_EXPORT
00247 double vl_rand_res53 ()
00248 {
00249 vl_uint32
00250 a = vl_rand_uint32() >> 5,
00251 b = vl_rand_uint32() >> 6 ;
00252 return (a * 67108864.0 + b) * (1.0 / 9007199254740992.0) ;
00253 }