Package org.apache.commons.math.random

Class Well44497b

java.lang.Object

org.apache.commons.math.random.BitsStreamGenerator

org.apache.commons.math.random.AbstractWell

org.apache.commons.math.random.Well44497b

All Implemented Interfaces:

java.io.Serializable, RandomGenerator

public class Well44497b
extends AbstractWell

This class implements the WELL44497b 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

Version:

$Revision: 1003892 $ $Date: 2010-10-02 23:28:56 +0200 (sam. 02 oct. 2010) $

See Also:

WELL Random number generator, Serialized Form

Field Summary

Fields inherited from class org.apache.commons.math.random.AbstractWell

i1, i2, i3, index, iRm1, iRm2, v

Constructor Summary

Constructors

Constructor	Description
Well44497b()	Creates a new random number generator.
Well44497b(int seed)	Creates a new random number generator using a single int seed.
Well44497b(int[] seed)	Creates a new random number generator using an int array seed.
Well44497b(long seed)	Creates a new random number generator using a single long seed.

Method Summary

Modifier and Type	Method	Description
protected int	next(int bits)	Generate next pseudorandom number.

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

setSeed, setSeed, setSeed

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

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

Constructor Detail

Well44497b

public Well44497b()

Creates a new random number generator.

The instance is initialized using the current time as the seed.

Well44497b

public Well44497b(int seed)

Creates a new random number generator using a single int seed.

Parameters:

seed - the initial seed (32 bits integer)

Well44497b

public Well44497b(int[] seed)

Creates a new random number generator using an int array seed.

Parameters:

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

Well44497b

public Well44497b(long seed)

Creates a new random number generator using a single long seed.

Parameters:

seed - the initial seed (64 bits integer)

Method Detail

next

protected int next(int bits)

Generate next pseudorandom number.

This method is the core generation algorithm. It is used by all the public generation methods for the various primitive types BitsStreamGenerator.nextBoolean(), BitsStreamGenerator.nextBytes(byte[]), BitsStreamGenerator.nextDouble(), BitsStreamGenerator.nextFloat(), BitsStreamGenerator.nextGaussian(), BitsStreamGenerator.nextInt(), BitsStreamGenerator.next(int) and BitsStreamGenerator.nextLong().

Specified by:

next in class AbstractWell

Parameters:

bits - number of random bits to produce

Returns:

random bits generated