mt19937ar.c File Reference
#include <stdio.h>

Go to the source code of this file.

Macros

#define LOWER_MASK   0x7fffffffUL /* least significant r bits */
 
#define M   397
 
#define MATRIX_A   0x9908b0dfUL /* constant vector a */
 
#define N   624
 
#define UPPER_MASK   0x80000000UL /* most significant w-r bits */
 

Functions

long genrand_int31 (void)
 
unsigned long genrand_int32 (void)
 
double genrand_real1 (void)
 
double genrand_real2 (void)
 
double genrand_real3 (void)
 
double genrand_res53 (void)
 
void init_by_array (unsigned long init_key[], int key_length)
 
void init_genrand (unsigned long s)
 

Variables

static unsigned long mt [N]
 
static int mti =N+1
 

Macro Definition Documentation

◆ LOWER_MASK

#define LOWER_MASK   0x7fffffffUL /* least significant r bits */

Definition at line 51 of file mt19937ar.c.

◆ M

#define M   397

Definition at line 48 of file mt19937ar.c.

◆ MATRIX_A

#define MATRIX_A   0x9908b0dfUL /* constant vector a */

Definition at line 49 of file mt19937ar.c.

◆ N

#define N   624

Definition at line 47 of file mt19937ar.c.

◆ UPPER_MASK

#define UPPER_MASK   0x80000000UL /* most significant w-r bits */

Definition at line 50 of file mt19937ar.c.

Function Documentation

◆ genrand_int31()

long genrand_int31 ( void  )

Definition at line 144 of file mt19937ar.c.

145 {
146  return (long)(genrand_int32()>>1);
147 }

References genrand_int32().

◆ genrand_int32()

unsigned long genrand_int32 ( void  )

Definition at line 106 of file mt19937ar.c.

107 {
108  unsigned long y;
109  static unsigned long mag01[2]={0x0UL, MATRIX_A};
110  /* mag01[x] = x * MATRIX_A for x=0,1 */
111 
112  if (mti >= N) { /* generate N words at one time */
113  int kk;
114 
115  if (mti == N+1) /* if init_genrand() has not been called, */
116  init_genrand(5489UL); /* a default initial seed is used */
117 
118  for (kk=0;kk<N-M;kk++) {
119  y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
120  mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
121  }
122  for (;kk<N-1;kk++) {
123  y = (mt[kk]&UPPER_MASK)|(mt[kk+1]&LOWER_MASK);
124  mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
125  }
126  y = (mt[N-1]&UPPER_MASK)|(mt[0]&LOWER_MASK);
127  mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
128 
129  mti = 0;
130  }
131 
132  y = mt[mti++];
133 
134  /* Tempering */
135  y ^= (y >> 11);
136  y ^= (y << 7) & 0x9d2c5680UL;
137  y ^= (y << 15) & 0xefc60000UL;
138  y ^= (y >> 18);
139 
140  return y;
141 }

References init_genrand(), LOWER_MASK, M, MATRIX_A, mt, mti, N, and UPPER_MASK.

Referenced by genrand_int31(), genrand_real1(), genrand_real2(), genrand_real3(), and genrand_res53().

◆ genrand_real1()

double genrand_real1 ( void  )

Definition at line 150 of file mt19937ar.c.

151 {
152  return genrand_int32()*(1.0/4294967295.0);
153  /* divided by 2^32-1 */
154 }

References genrand_int32().

Referenced by generateMeasurementOutcome().

◆ genrand_real2()

double genrand_real2 ( void  )

Definition at line 157 of file mt19937ar.c.

158 {
159  return genrand_int32()*(1.0/4294967296.0);
160  /* divided by 2^32 */
161 }

References genrand_int32().

◆ genrand_real3()

double genrand_real3 ( void  )

Definition at line 164 of file mt19937ar.c.

165 {
166  return (((double)genrand_int32()) + 0.5)*(1.0/4294967296.0);
167  /* divided by 2^32 */
168 }

References genrand_int32().

◆ genrand_res53()

double genrand_res53 ( void  )

Definition at line 171 of file mt19937ar.c.

172 {
173  unsigned long a=genrand_int32()>>5, b=genrand_int32()>>6;
174  return(a*67108864.0+b)*(1.0/9007199254740992.0);
175 }

References genrand_int32().

◆ init_by_array()

void init_by_array ( unsigned long  init_key[],
int  key_length 
)

Definition at line 80 of file mt19937ar.c.

81 {
82  int i, j, k;
83  init_genrand(19650218UL);
84  i=1; j=0;
85  k = (N>key_length ? N : key_length);
86  for (; k; k--) {
87  mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL))
88  + init_key[j] + j; /* non linear */
89  mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
90  i++; j++;
91  if (i>=N) { mt[0] = mt[N-1]; i=1; }
92  if (j>=key_length) j=0;
93  }
94  for (k=N-1; k; k--) {
95  mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL))
96  - i; /* non linear */
97  mt[i] &= 0xffffffffUL; /* for WORDSIZE > 32 machines */
98  i++;
99  if (i>=N) { mt[0] = mt[N-1]; i=1; }
100  }
101 
102  mt[0] = 0x80000000UL; /* MSB is 1; assuring non-zero initial array */
103 }

References init_genrand(), mt, and N.

Referenced by seedQuEST().

◆ init_genrand()

void init_genrand ( unsigned long  s)

Definition at line 61 of file mt19937ar.c.

62 {
63  mt[0]= s & 0xffffffffUL;
64  for (mti=1; mti<N; mti++) {
65  mt[mti] =
66  (1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti);
67  /* See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier. */
68  /* In the previous versions, MSBs of the seed affect */
69  /* only MSBs of the array mt[]. */
70  /* 2002/01/09 modified by Makoto Matsumoto */
71  mt[mti] &= 0xffffffffUL;
72  /* for >32 bit machines */
73  }
74 }

References mt, mti, and N.

Referenced by genrand_int32(), and init_by_array().

Variable Documentation

◆ mt

unsigned long mt[N]
static

Definition at line 57 of file mt19937ar.c.

Referenced by genrand_int32(), init_by_array(), and init_genrand().

◆ mti

int mti =N+1
static

Definition at line 58 of file mt19937ar.c.

Referenced by genrand_int32(), and init_genrand().

unsigned long genrand_int32(void)
Definition: mt19937ar.c:106
void init_genrand(unsigned long s)
Definition: mt19937ar.c:61
#define M
Definition: mt19937ar.c:48
#define MATRIX_A
Definition: mt19937ar.c:49
static unsigned long mt[N]
Definition: mt19937ar.c:57
static int mti
Definition: mt19937ar.c:58
#define N
Definition: mt19937ar.c:47
#define UPPER_MASK
Definition: mt19937ar.c:50
#define LOWER_MASK
Definition: mt19937ar.c:51