blob: 4244dafb922f55d7a4c0b04852677f69ef8ff133 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
/*-------------------------------------------------------------------------
*
* geqo_random.h
* random number generator
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/geqo_random.h,v 1.14 2003/11/29 22:41:07 pgsql Exp $
*
*-------------------------------------------------------------------------
*/
/* contributed by:
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
* Martin Utesch * Institute of Automatic Control *
= = University of Mining and Technology =
* utesch@aut.tu-freiberg.de * Freiberg, Germany *
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
*/
/* -- parts of this are adapted from D. Whitley's Genitor algorithm -- */
#ifndef GEQO_RANDOM_H
#define GEQO_RANDOM_H
#include <math.h>
/* geqo_rand returns a random float value between 0 and 1 inclusive */
#define geqo_rand() (((double) random()) / ((double) MAX_RANDOM_VALUE))
/* geqo_randint returns integer value between lower and upper inclusive */
#define geqo_randint(upper,lower) \
( (int) floor( geqo_rand()*(((upper)-(lower))+0.999999) ) + (lower) )
#endif /* GEQO_RANDOM_H */
|
