mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-10-31 23:57:10 -04:00
5ac886855d
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6437 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
55 lines
2.2 KiB
C
Executable File
55 lines
2.2 KiB
C
Executable File
/* RAND.H - Interface to random number generation procedures. */
|
|
|
|
/* Copyright (c) 1995-2012 by Radford M. Neal.
|
|
*
|
|
* Permission is granted for anyone to copy, use, modify, and distribute
|
|
* these programs and accompanying documents for any purpose, provided
|
|
* this copyright notice is retained and prominently displayed, and note
|
|
* is made of any changes made to these programs. These programs and
|
|
* documents are distributed without any warranty, express or implied.
|
|
* As the programs were written for research purposes only, they have not
|
|
* been tested to the degree that would be advisable in any important
|
|
* application. All use of these programs is entirely at the user's own
|
|
* risk.
|
|
*/
|
|
|
|
|
|
/* STATE OF RANDOM NUMBER GENERATOR. */
|
|
|
|
#define N_tables 5 /* Number of tables of real random numbers */
|
|
|
|
typedef struct
|
|
{ int seed; /* Seed state derives from */
|
|
int ptr[N_tables]; /* Pointers for tables of real random numbers */
|
|
unsigned short state48[3]; /* State of 'rand48' pseudo-random generator */
|
|
} rand_state;
|
|
|
|
|
|
/* BASIC PSEUDO-RANDOM GENERATION PROCEDURES. */
|
|
|
|
void rand_seed (int); /* Initialize current state structure by seed */
|
|
|
|
void rand_use_state (rand_state *); /* Start using given state structure */
|
|
rand_state *rand_get_state (void); /* Return pointer to current state */
|
|
|
|
int rand_word (void); /* Generate random 31-bit positive integer */
|
|
|
|
|
|
/* GENERATORS FOR VARIOUS DISTRIBUTIONS. */
|
|
|
|
double rand_uniform (void); /* Uniform from [0,1) */
|
|
double rand_uniopen (void); /* Uniform from (0,1) */
|
|
|
|
int rand_int (int); /* Uniform from 0, 1, ... (n-1) */
|
|
int rand_pickd (double *, int); /* From 0 ... (n-1), with given distribution */
|
|
int rand_pickf (float *, int); /* Same as above, but with floats */
|
|
void rand_permutation (int *, int); /* Random permutation */
|
|
|
|
int rand_poisson (double); /* Poisson with given mean */
|
|
double rand_gaussian (void); /* Gaussian with mean zero and unit variance */
|
|
double rand_logistic (void); /* Logistic centred at zero with unit width */
|
|
double rand_cauchy (void); /* Cauchy centred at zero with unit width */
|
|
double rand_gamma (double); /* Gamma with given shape parameter */
|
|
double rand_exp (void); /* Exponential with mean one */
|
|
double rand_beta (double, double); /* Beta with given parameters */
|