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gregl |
2.6 |
/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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greg |
1.1 |
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gregl |
2.5 |
/* SCCSid "$SunId$ SGI" */ |
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greg |
1.1 |
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/* |
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greg |
1.4 |
* random.h - header file for random(3) and urand() function. |
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greg |
1.1 |
* |
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* 10/1/85 |
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*/ |
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greg |
2.2 |
#ifdef MSDOS |
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greg |
1.3 |
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greg |
2.3 |
#define random() ((long)rand()<<16^(long)rand()<<6^(long)rand()>>4) |
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greg |
2.2 |
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#define frandom() (rand()*(1./32768.)) |
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#else |
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#ifdef BSD |
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greg |
1.1 |
extern long random(); |
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greg |
2.2 |
#define frandom() (random()*(1./2147483648.)) |
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greg |
1.3 |
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#else |
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extern long lrand48(); |
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extern double drand48(); |
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greg |
2.2 |
#define random() lrand48() |
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#define frandom() drand48() |
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greg |
1.3 |
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#endif |
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greg |
2.2 |
#endif |
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greg |
1.4 |
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35 |
greg |
2.4 |
#ifdef MC |
36 |
gregl |
2.5 |
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greg |
2.4 |
#define urand(i) frandom() |
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gregl |
2.5 |
#define initurand(n) (n) |
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greg |
2.4 |
#else |
41 |
gregl |
2.5 |
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42 |
gregl |
2.6 |
extern unsigned short *urperm; |
43 |
gregl |
2.5 |
extern int urmask, initurand(); |
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greg |
2.2 |
#define urand(i) ((urperm[(i)&urmask]+frandom())/(urmask+1)) |
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gregl |
2.5 |
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47 |
greg |
2.4 |
#endif |