net.sf.doodleproject.numerics4j.statistics.distribution
Class LaplaceDistribution

java.lang.Object
  net.sf.doodleproject.numerics4j.statistics.distribution.ContinuousDistribution
      net.sf.doodleproject.numerics4j.statistics.distribution.LaplaceDistribution

All Implemented Interfaces:

Distribution

public class LaplaceDistribution
extends ContinuousDistribution

The Laplace distribution.

References:

1. Eric W. Weisstein. "Laplace Distribution." From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/LaplaceDistribution.html

Since:

1.2

Version:

$Revision: 1.3 $ $Date: 2007/11/18 23:51:21 $

Constructor Summary

LaplaceDistribution()
Default constructor.

LaplaceDistribution(double m, double s)
Create a distribution with the given mean and scale.

Method Summary

double	cumulativeProbability(double x) The CDF for this distribution.
double	getMean() Access the mean.
double	getScale() Access the scale.
double	inverseCumulativeProbability(double p) The inverse CDF for this distribution.
void	setMean(double m) Modify the mean.
void	setScale(double s) Modify the scale.

Methods inherited from class net.sf.doodleproject.numerics4j.statistics.distribution.ContinuousDistribution

findInverseCumulativeProbability

Methods inherited from class java.lang.Object

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

Constructor Detail

LaplaceDistribution

public LaplaceDistribution()

Default constructor. Mean is set to zero and scale is set to one.

LaplaceDistribution

public LaplaceDistribution(double m,
                           double s)

Create a distribution with the given mean and scale.

Parameters:

m - the mean.

s - the scale.

Method Detail

cumulativeProbability

public double cumulativeProbability(double x)

The CDF for this distribution. This method returns P(X < x).

Specified by:

cumulativeProbability in class ContinuousDistribution

Parameters:

x - the value at which the CDF is evaluated.

Returns:

CDF for this distribution.

getMean

public double getMean()

Access the mean.

Returns:

the mean.

getScale

public double getScale()

Access the scale.

Returns:

the scale.

inverseCumulativeProbability

public double inverseCumulativeProbability(double p)

The inverse CDF for this distribution. This method returns x such that, P(X < x) = p.

Specified by:

inverseCumulativeProbability in class ContinuousDistribution

Parameters:

p - the cumulative probability.

Returns:

x

setMean

public void setMean(double m)

Modify the mean.

Parameters:

m - the new mean value.

setScale

public void setScale(double s)

Modify the scale.

Parameters:

s - the new scale value.