Class MersenneTwisterRNG
- java.lang.Object
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- java.util.Random
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- org.uncommons.maths.random.MersenneTwisterRNG
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- All Implemented Interfaces:
Serializable
,RepeatableRNG
public class MersenneTwisterRNG extends Random implements RepeatableRNG
Random number generator based on the Mersenne Twister algorithm developed by Makoto Matsumoto and Takuji Nishimura.
This is a very fast random number generator with good statistical properties (it passes the full DIEHARD suite). This is the best RNG for most experiments. If a non-linear generator is required, use the slower
AESCounterRNG
RNG.This PRNG is deterministic, which can be advantageous for testing purposes since the output is repeatable. If multiple instances of this class are created with the same seed they will all have identical output.
This code is translated from the original C version and assumes that we will always seed from an array of bytes. I don't pretend to know the meanings of the magic numbers or how it works, it just does.
NOTE: Because instances of this class require 128-bit seeds, it is not possible to seed this RNG using the
Random.setSeed(long)
method inherited fromRandom
. Calls to this method will have no effect. Instead the seed must be set by a constructor.- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description MersenneTwisterRNG()
Creates a new RNG and seeds it using the default seeding strategy.MersenneTwisterRNG(byte[] seed)
Creates an RNG and seeds it with the specified seed data.MersenneTwisterRNG(SeedGenerator seedGenerator)
Seed the RNG using the provided seed generation strategy.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description byte[]
getSeed()
protected int
next(int bits)
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Constructor Detail
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MersenneTwisterRNG
public MersenneTwisterRNG()
Creates a new RNG and seeds it using the default seeding strategy.
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MersenneTwisterRNG
public MersenneTwisterRNG(SeedGenerator seedGenerator) throws SeedException
Seed the RNG using the provided seed generation strategy.- Parameters:
seedGenerator
- The seed generation strategy that will provide the seed value for this RNG.- Throws:
SeedException
- If there is a problem generating a seed.
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MersenneTwisterRNG
public MersenneTwisterRNG(byte[] seed)
Creates an RNG and seeds it with the specified seed data.- Parameters:
seed
- The seed data used to initialise the RNG.
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Method Detail
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getSeed
public byte[] getSeed()
- Specified by:
getSeed
in interfaceRepeatableRNG
- Returns:
- The seed data used to initialise this pseudo-random number generator.
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