de.lmu.ifi.dbs.elki.math.statistics.distribution

Class ConstantDistribution

java.lang.Object

de.lmu.ifi.dbs.elki.math.statistics.distribution.ConstantDistribution

All Implemented Interfaces:

Distribution, DistributionWithRandom

public class ConstantDistribution
extends Object
implements DistributionWithRandom

Pseudo distribution, that has a unique constant value.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) double	c The constant

Constructor Summary

Constructors

Constructor and Description
ConstantDistribution(double c) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
double	cdf(double val) Return the cumulative density function at the given value.
double	nextRandom() Generate a new random value
double	pdf(double val) Return the density of an existing value
double	quantile(double val) Quantile aka probit (for normal) aka inverse CDF (invcdf, cdf^-1) function.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.lmu.ifi.dbs.elki.math.statistics.distribution.Distribution

toString

Field Detail

c

final double c

The constant

Constructor Detail

ConstantDistribution

public ConstantDistribution(double c)

Constructor.

Parameters:

c - Constant

Method Detail

nextRandom

public double nextRandom()

Description copied from interface: DistributionWithRandom

Generate a new random value

Specified by:

nextRandom in interface DistributionWithRandom

Returns:

new random value

pdf

public double pdf(double val)

Description copied from interface: Distribution

Return the density of an existing value

Specified by:

pdf in interface Distribution

Parameters:

val - existing value

Returns:

distribution density

cdf

public double cdf(double val)

Description copied from interface: Distribution

Return the cumulative density function at the given value.

Specified by:

cdf in interface Distribution

Parameters:

val - existing value

Returns:

cumulative density

quantile

public double quantile(double val)

Description copied from interface: Distribution

Quantile aka probit (for normal) aka inverse CDF (invcdf, cdf^-1) function.

Specified by:

quantile in interface Distribution

Parameters:

val - Quantile to find

Returns:

Quantile position