net.sf.doodleproject.numerics4j.random
Class GammaRandomVariable

java.lang.Object
  net.sf.doodleproject.numerics4j.random.AbstractContinuousRandomVariable
      net.sf.doodleproject.numerics4j.random.GammaRandomVariable

All Implemented Interfaces:

ContinuousRandomVariable

public class GammaRandomVariable
extends AbstractContinuousRandomVariable

A random variable generator for the Gamma distribution.

References:

1. Wikipedia contributors, "Gamma distribution," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/wiki/Gamma_distribution

Since:

1.3

Version:

$Revision: 1.5 $ $Date: 2007/11/18 23:51:19 $

Constructor Summary

GammaRandomVariable()
Default constructor.

GammaRandomVariable(double a, double b)
Create a random variable with the given alpha and beta values.

GammaRandomVariable(double a, double b, RNG source)
Create a random variable with the given parameters.

Method Summary

double	nextRandomVariable() Access the next random variable from this generator.
static double	nextRandomVariable(double a, double b, RNG source) Access the next random variable using the given generator.

Methods inherited from class net.sf.doodleproject.numerics4j.random.AbstractContinuousRandomVariable

getSource, nextRandomNumber

Methods inherited from class java.lang.Object

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

Constructor Detail

GammaRandomVariable

public GammaRandomVariable()

Default constructor. Alpha and beta are both set to 1.

GammaRandomVariable

public GammaRandomVariable(double a,
                           double b)

Create a random variable with the given alpha and beta values.

Parameters:

a - the alpha parameter.

b - the beta parameter.

GammaRandomVariable

public GammaRandomVariable(double a,
                           double b,
                           RNG source)

Create a random variable with the given parameters.

Parameters:

a - the alpha parameter.

b - the beta parameter.

source - the source generator

Method Detail

nextRandomVariable

public static double nextRandomVariable(double a,
                                        double b,
                                        RNG source)

Access the next random variable using the given generator.

Parameters:

a - the alpha parameter.

b - the beta parameter.

source - the source generator

Returns:

the next random variable.

nextRandomVariable

public double nextRandomVariable()

Access the next random variable from this generator.

Returns:

the next random variable.