nl.tudelft.simulation.jstats.distributions

Class DistGamma

java.lang.Object

nl.tudelft.simulation.jstats.distributions.Dist

nl.tudelft.simulation.jstats.distributions.DistContinuous

nl.tudelft.simulation.jstats.distributions.DistGamma

All Implemented Interfaces:

Serializable

public class DistGamma
extends DistContinuous

The Gamma distribution. For more information on this distribution see http://mathworld.wolfram.com/GammaDistribution.html

(c) copyright 2002-2004 Delft University of Technology , the Netherlands.
See for project information www.simulation.tudelft.nl
License of use: Lesser General Public License (LGPL) , no warranty.

Since:

1.2

Version:

$Revision: 1.1 $ $Date: 2007/01/06 13:25:42 $

Author:

Alexander Verbraeck
Peter Jacobs

See Also:

Serialized Form

Field Summary

Fields inherited from class nl.tudelft.simulation.jstats.distributions.Dist

stream

Constructor Summary

Constructors

Constructor and Description
DistGamma(StreamInterface stream, double alpha, double beta) constructs a new gamma distribution.

Method Summary

Methods

Modifier and Type	Method and Description
double	draw() draws the next stream value according to the probability of this this distribution.
double	probDensity(double observation) returns the propbability density value of an observation
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

DistGamma

public DistGamma(StreamInterface stream,
         double alpha,
         double beta)

constructs a new gamma distribution. The gamma distribution represents the time to complete some task, e.g. customer service or machine repair

Parameters:

stream - the numberstream

alpha - is the shape parameter alpha>0

beta - is the scale parameter beta>0

Method Detail

draw

public double draw()

Description copied from class: DistContinuous

draws the next stream value according to the probability of this this distribution.

Specified by:

draw in class DistContinuous

Returns:

the next double value drawn.

See Also:

DistContinuous.draw()

probDensity

public double probDensity(double observation)

Description copied from class: DistContinuous

returns the propbability density value of an observation

Specified by:

probDensity in class DistContinuous

Parameters:

observation - the observation.

Returns:

double the probability density.

See Also:

#probDensity(double)

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()