Package org.apache.commons.math.random

Class AbstractWell

java.lang.Object

org.apache.commons.math.random.BitsStreamGenerator

org.apache.commons.math.random.AbstractWell

All Implemented Interfaces:

Serializable, RandomGenerator

Direct Known Subclasses:

Well1024a, Well19937a, Well19937c, Well44497a, Well44497b, Well512a

public abstract class AbstractWell
extends BitsStreamGenerator
implements Serializable

This abstract class implements the WELL class of pseudo-random number generator from François Panneton, Pierre L'Ecuyer and Makoto Matsumoto.

This generator is described in a paper by François Panneton, Pierre L'Ecuyer and Makoto Matsumoto Improved Long-Period Generators Based on Linear Recurrences Modulo 2 ACM Transactions on Mathematical Software, 32, 1 (2006). The errata for the paper are in wellrng-errata.txt.

Since:

2.2

See Also:

• WELL Random number generator
• Serialized Form

Method Summary

Modifier and Type	Method	Description
void	setSeed(int seed)	Reinitialize the generator as if just built with the given int seed.
void	setSeed(int[] seed)	Reinitialize the generator as if just built with the given int array seed.
void	setSeed(long seed)	Reinitialize the generator as if just built with the given long seed.

Methods inherited from class org.apache.commons.math.random.BitsStreamGenerator

nextBoolean, nextBytes, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

setSeed

public void setSeed(int seed)

Reinitialize the generator as if just built with the given int seed.

The state of the generator is exactly the same as a new generator built with the same seed.

Specified by:

setSeed in interface RandomGenerator

Specified by:

setSeed in class BitsStreamGenerator

Parameters:

seed - the initial seed (32 bits integer)

setSeed

public void setSeed(int[] seed)

Reinitialize the generator as if just built with the given int array seed.

The state of the generator is exactly the same as a new generator built with the same seed.

Specified by:

setSeed in interface RandomGenerator

Specified by:

setSeed in class BitsStreamGenerator

Parameters:

seed - the initial seed (32 bits integers array), if null the seed of the generator will be related to the current time

setSeed

public void setSeed(long seed)

Reinitialize the generator as if just built with the given long seed.

The state of the generator is exactly the same as a new generator built with the same seed.

Specified by:

setSeed in interface RandomGenerator

Specified by:

setSeed in class BitsStreamGenerator

Parameters:

seed - the initial seed (64 bits integer)