double ran2(long* seed);
Long period (> 2 X 10^18) random number generator of L'Ecuyer with Bays-Durham shuffle and added safeguards. Returns a uniform random deviate between 0.0 and 1.0 (exclusive of the endpoint values). Call with idum a negative integer to initialize; thereafter, do not alter idum between successive deviates in a sequence.
Parameters:
seed | Random number generator seed. |
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Returns:
The next random number from the generator.
Usage:
long seed = -1L; /* Initialize generator */
double r = ran2(&seed);
Header:
#include "deviate.h"