org.spaceroots.mantissa.random

Class UniformRandomGenerator

java.lang.Object

org.spaceroots.mantissa.random.UniformRandomGenerator

All Implemented Interfaces:

java.io.Serializable, NormalizedRandomGenerator

public class UniformRandomGenerator
extends java.lang.Object
implements NormalizedRandomGenerator

This class implements a normalized uniform random generator.

Since this is a normalized random generator, it has a null mean and a unit standard deviation. Beeing also a uniform generator, it produces numbers in the range [-sqrt(3) ; sqrt(3)]. It uses the MersenneTwister generator as the underlying generator.

Version:

$Id: UniformRandomGenerator.java 1709 2006-12-03 21:16:50Z luc $

Author:

L. Maisonobe

See Also:

MersenneTwister, Serialized Form

Constructor Summary

Constructors

Constructor and Description
UniformRandomGenerator() Create a new generator.
UniformRandomGenerator(int seed) Creates a new random number generator using a single int seed.
UniformRandomGenerator(int[] seed) Creates a new random number generator using an int array seed.
UniformRandomGenerator(long seed) Create a new generator initialized with a single long seed.

Method Summary

Modifier and Type	Method and Description
double	nextDouble() Generate a random scalar with null mean and unit standard deviation.

Methods inherited from class java.lang.Object

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

Constructor Detail

UniformRandomGenerator

public UniformRandomGenerator()

Create a new generator. The seed of the generator is related to the current time.

UniformRandomGenerator

public UniformRandomGenerator(int seed)

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

Parameters:

seed - the initial seed (32 bits integer)

UniformRandomGenerator

public UniformRandomGenerator(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

UniformRandomGenerator

public UniformRandomGenerator(long seed)

Create a new generator initialized with a single long seed.

Parameters:

seed - seed for the generator (64 bits integer)

Method Detail

nextDouble

public double nextDouble()

Generate a random scalar with null mean and unit standard deviation.

The number generated is uniformly distributed between -sqrt(3) and sqrt(3).

Specified by:

nextDouble in interface NormalizedRandomGenerator

Returns:

a random scalar with null mean and unit standard deviation