src/common/random.h

/* Copyright (c) 1986 Regents of the University of California */

/* SCCSid "$SunId$ LBL" */

/*
 *  random.h - header file for random(3) and urand() function.
 *
 *     10/1/85
 */

#ifdef  BSD

extern long  random();

#define  frandom()      (random()*(1./2147483648.))

#else

extern long  lrand48();
extern double  drand48();

#define  random()       lrand48()
#define  frandom()      drand48()

#endif

#define  urand(i)       ((urperm[(i)&urmask]+frandom())/(urmask+1))

extern short  *urperm;
extern int  urmask;
Revision:	1.4
Committed:	Fri May 17 13:51:29 1991 UTC (32 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+6 -1 lines
Log Message:	added urand() definition
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1986 Regents of the University of California */
2
3			/* SCCSid "$SunId$ LBL" */
4
5			/*
6	greg	1.4	* random.h - header file for random(3) and urand() function.
7	greg	1.1	*
8			* 10/1/85
9			*/
10
11	greg	1.3	#ifdef BSD
12
13	greg	1.1	extern long random();
14
15	greg	1.2	#define frandom() (random()*(1./2147483648.))
16	greg	1.3
17			#else
18
19			extern long lrand48();
20			extern double drand48();
21
22			#define random() lrand48()
23			#define frandom() drand48()
24
25			#endif
26	greg	1.4
27			#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1))
28
29			extern short *urperm;
30			extern int urmask;