edu.indiana.util.distribution
Class NormalDistribution

java.lang.Object
  edu.indiana.util.distribution.NormalDistribution

All Implemented Interfaces:

Distribution, java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

ClampedNormalDistribution

public class NormalDistribution
extends java.lang.Object
implements Distribution, java.lang.Cloneable

A specification of a normal random distribution.

See Also:

Serialized Form

Field Summary

protected double	mean
protected double	standardDeviation

Constructor Summary

NormalDistribution()
Construct a NormalDistribution.

NormalDistribution(double mean, double standardDeviation)
Creates new NormalDistribution

Method Summary

java.lang.Object	clone() Obtain a copy of this distribution.
boolean	equals(java.lang.Object other)
int	generateIntValue() Generate an int value according to this distribution.
double	generateValue() Generate a random double from a normal distribution with a specified mean and standard deviation.
static void	main(java.lang.String[] args)
void	setParameters(double[] parameters) Set the parameters for this normal distribution.
java.lang.String	toString() Obtain a String representation of this distribution.

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

mean

protected double mean

standardDeviation

protected double standardDeviation

Constructor Detail

NormalDistribution

public NormalDistribution()

Construct a NormalDistribution. Parameters must be set with setParameters().

NormalDistribution

public NormalDistribution(double mean,
                          double standardDeviation)

Creates new NormalDistribution

Method Detail

generateValue

public double generateValue()

Generate a random double from a normal distribution with a specified mean and standard deviation. This algorithm is from _The_Art_Of_Computer_Programming_ by Donald Knuth, 2nd ed, p. 117.

Specified by:

generateValue in interface Distribution

generateIntValue

public int generateIntValue()

Description copied from interface: Distribution

Generate an int value according to this distribution.

Specified by:

generateIntValue in interface Distribution

setParameters

public void setParameters(double[] parameters)

Set the parameters for this normal distribution. The first position in the array is the mean, and the second is the standard deviation.

Specified by:

setParameters in interface Distribution

toString

public java.lang.String toString()

Obtain a String representation of this distribution.

Specified by:

toString in interface Distribution

Overrides:

toString in class java.lang.Object

clone

public java.lang.Object clone()

Obtain a copy of this distribution.

Specified by:

clone in interface Distribution

Overrides:

clone in class java.lang.Object

equals

public boolean equals(java.lang.Object other)

Overrides:

equals in class java.lang.Object

main

public static void main(java.lang.String[] args)