Package nl.tudelft.simulation.jstats.distributions

Class DistBeta

java.lang.Object

nl.tudelft.simulation.jstats.distributions.Dist

nl.tudelft.simulation.jstats.distributions.DistContinuous

nl.tudelft.simulation.jstats.distributions.DistBeta

All Implemented Interfaces:

Serializable

public class DistBeta
extends DistContinuous

The Beta distribution. For more information on this distribution see https://mathworld.wolfram.com/BetaDistribution.html

Copyright (c) 2002-2023 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://simulation.tudelft.nl. The DSOL project is distributed under a three-clause BSD-style license, which can be found at https://https://simulation.tudelft.nl/dsol/docs/latest/license.html.

Author:

Peter Jacobs , Alexander Verbraeck

See Also:

Serialized Form

Field Summary

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

stream

Constructor Summary

Constructors

Constructor	Description
DistBeta(StreamInterface stream, double alpha1, double alpha2)	constructs a new beta distribution.

Method Summary

Modifier and Type	Method	Description
double	draw()	draws the next stream value according to the probability of this this distribution.
double	getAlpha1()	Return the first shape parameter α1 for the distribution.
double	getAlpha2()	Return the second shape parameter α2for the distribution.
double	getProbabilityDensity(double x)	returns the probability density value of a value x.
void	setStream(StreamInterface stream)	Replace the random number stream.
String	toString()

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

getStream

Methods inherited from class java.lang.Object

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

Constructor Detail

DistBeta

public DistBeta(StreamInterface stream,
                double alpha1,
                double alpha2)

constructs a new beta distribution.

Parameters:

stream - StreamInterface; the stream.

alpha1 - double; the first shape parameter α₁ for the distribution

alpha2 - double; the second shape parameter α₂for the distribution

Throws:

IllegalArgumentException - when alpha1 <= 0.0 or alpha2 <= 0.0

Method Detail

draw

public double draw()

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.

getProbabilityDensity

public double getProbabilityDensity(double x)

returns the probability density value of a value x.

Specified by:

getProbabilityDensity in class DistContinuous

Parameters:

x - double; the value for which the density function needs to be calculated

Returns:

double; the probability density for value x

getAlpha1

public double getAlpha1()

Return the first shape parameter α₁ for the distribution.

Returns:

double; the first shape parameter α₁ for the distribution

getAlpha2

public double getAlpha2()

Return the second shape parameter α₂for the distribution.

Returns:

double; the second shape parameter α₂for the distribution

setStream

public void setStream(StreamInterface stream)

Replace the random number stream.

Overrides:

setStream in class Dist

Parameters:

stream - StreamInterface; the new random number stream

toString

public String toString()

Overrides:

toString in class Object