org.uma.jmetal.util.pseudorandom.impl

Class ExtendedPseudoRandomGenerator

java.lang.Object

org.uma.jmetal.util.pseudorandom.impl.ExtendedPseudoRandomGenerator

All Implemented Interfaces:

Serializable, PseudoRandomGenerator

public class ExtendedPseudoRandomGenerator
extends Object
implements PseudoRandomGenerator

Extended pseudo random number generator based on the decorator pattern. Two new methods are added: randNormal() and randSphere()

Author:

Antonio J. Nebro

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ExtendedPseudoRandomGenerator(PseudoRandomGenerator randomGenerator)

Method Summary

Modifier and Type	Method and Description
String	getName()
long	getSeed()
double	nextDouble()
double	nextDouble(double lowerBound, double upperBound)
int	nextInt(int lowerBound, int upperBound)
double	randNormal(double mean, double standardDeviation) Use the polar form of the Box-Muller transformation to obtain a pseudo random number from a Gaussian distribution Code taken from Maurice Clerc's implementation
double[]	randSphere(int dimension) Get a random point from an hypersphere (center = 0, radius = 1) Code taken from Maurice Clerc's implementation
double[]	randSphere(int dimension, double center, double radius) Ger a random point from an hypersphere Code taken from Maurice Clerc's implementation
void	setSeed(long seed)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtendedPseudoRandomGenerator

public ExtendedPseudoRandomGenerator(PseudoRandomGenerator randomGenerator)

Method Detail

nextInt

public int nextInt(int lowerBound,
                   int upperBound)

Specified by:

nextInt in interface PseudoRandomGenerator

nextDouble

public double nextDouble(double lowerBound,
                         double upperBound)

Specified by:

nextDouble in interface PseudoRandomGenerator

nextDouble

public double nextDouble()

Specified by:

nextDouble in interface PseudoRandomGenerator

setSeed

public void setSeed(long seed)

Specified by:

setSeed in interface PseudoRandomGenerator

getSeed

public long getSeed()

Specified by:

getSeed in interface PseudoRandomGenerator

getName

public String getName()

Specified by:

getName in interface PseudoRandomGenerator

randNormal

public double randNormal(double mean,
                         double standardDeviation)

Use the polar form of the Box-Muller transformation to obtain a pseudo random number from a Gaussian distribution Code taken from Maurice Clerc's implementation

Parameters:

mean -

standardDeviation -

Returns:

A pseudo random number

randSphere

public double[] randSphere(int dimension)

Get a random point from an hypersphere (center = 0, radius = 1) Code taken from Maurice Clerc's implementation

Parameters:

dimension -

Returns:

A pseudo random point

randSphere

public double[] randSphere(int dimension,
                           double center,
                           double radius)

Ger a random point from an hypersphere Code taken from Maurice Clerc's implementation

Parameters:

center -

radius -

Returns:

A pseudo random number