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#ifndef RAND_H
#define RAND_H
/*
* Copyright 1998 Graeme W. Gill
* All rights reserved.
*
* This material is licenced under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 :-
* see the License.txt file for licencing details.
*/
#ifdef __cplusplus
extern "C" {
#endif
/* - - - - - - - - - - - - - - - */
/* Global state random generator */
/* Return a random number between 0 and 4294967294 */
unsigned int
rand32( /* Return 32 bit random number */
unsigned int seed); /* Optional seed. Non-zero re-initialized with that seed */
/* Return a random integer in the range min to max inclusive */
int i_rand(int min, int max);
/* Return a uniform random double in the range min to max inclusive */
double d_rand(double min, double max);
/* Return a squared distribution random double in the range min to max inclusive */
double d2_rand(double min, double max);
/* Return a random floating point number with a gausian/normal */
/* distribution, centered about 0.0, with standard deviation 1.0 */
/* and an average deviation of 0.564 */
double norm_rand(void);
/* - - - - - - - - - - - - - - - */
/* Explicit state random generator */
/* Use NULL for global state */
#define RAND_TSIZE 2843 /* Prime */
#define RAND_SEED 0x12345678 /* Default seed */
/* Should set to 0 to default intialize */
typedef struct {
int pvs_inited;
unsigned int ran, last;
unsigned int pvs[RAND_TSIZE];
/* normal distribution 2nd value */
int r2; /* 2nd value available */
double nr2; /* 2nd value */
} rand_state;
/* Init rand_state to default */
void rand_init(rand_state *p);
/* Return a random number between 0 and 4294967294 */
unsigned int
rand32_th(rand_state *p,
unsigned int seed); /* Optional seed. Non-zero re-initialized with that seed */
/* Return a random integer in the range min to max inclusive */
int i_rand_th(rand_state *p, int min, int max);
/* Return a uniform random double in the range min to max inclusive */
double d_rand_th(rand_state *p, double min, double max);
/* Return a squared distribution random double in the range min to max inclusive */
double d2_rand_th(rand_state *p, double min, double max);
/* Return a random floating point number with a gausian/normal */
/* distribution, centered about 0.0, with standard deviation 1.0 */
/* and an average deviation of 0.564 */
double norm_rand_th(rand_state *p);
#ifdef __cplusplus
}
#endif
#endif /* RAND_H */
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