com.numericalmethod.suanshu.stats.random.univariate

Interface RandomNumberGenerator

All Superinterfaces:

java.io.Serializable

All Known Subinterfaces:

LinearCongruentialGenerator, RandomBetaGenerator, RandomExpGenerator, RandomGammaGenerator, RandomLongGenerator, RandomStandardNormalNumberGenerator

All Known Implementing Classes:

BinomialRng, BoxMuller, Cheng1978, CompositeLinearCongruentialGenerator, ConcurrentCachedRLG, ConcurrentCachedRNG, HiddenMarkovModel, HiddenMarkovModel, HiddenMarkovModel, HmmBaumWelch, HmmTrainByEM, InverseTransformSampling, InverseTransformSamplingExpRng, InverseTransformSamplingGammaRng, Knuth1969, KunduGupta2007, LEcuyer, Lehmer, LogNormalRng, MarsagliaBray1964, MarsagliaTsang2000, MersenneTwister, MRG, MWC8222, NormalRng, RayleighRng, SHR0, SHR3, SimpleMC, StandardNormalRng, UniformRng, VanDerWaerden1969, WeibullRng, XiTanLiu2010a, XiTanLiu2010b, Ziggurat2000, Ziggurat2000Exp, Zignor2005

public interface RandomNumberGenerator
extends java.io.Serializable

A (pseudo) random number generator is an algorithm designed to generate a sequence of numbers that lack any pattern. However, it is very important to know that the sequence is not random at all and that it is completely determined by a relatively small set of initial values. Knowing the generation algorithm and the states can predict the next value, as the values are generated in a deterministic way.

By default, an implementation of RandomNumberGenerator is not thread-safe, and thus should not be shared among multiple threads. If a RandomNumberGenerator instance is used in a multi-threaded program, for example, use

RandomNumberGenerator rng = RandomNumberGenerators.synchronizedRNG(new Gaussian());

See Also:

• Wikipedia: Random number generation
• Wikipedia: Pseudorandom number generator

Method Summary

Modifier and Type	Method and Description
double	nextDouble() Get the next random double.
void	seed(long... seeds) Seed the random number generator to produce repeatable sequences.

Method Detail

seed

void seed(long... seeds)

Seed the random number generator to produce repeatable sequences.

Parameters:

seeds - the seeds

nextDouble

double nextDouble()

Get the next random double.

Returns:

the next random number