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

public class ConstantDistribution
extends java.lang.Object
implements Distribution

Pseudo distribution, that has a unique constant value.

Since:

0.5.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ConstantDistribution.Parameterizer Parameterization class

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

Modifier and Type	Method and Description
double	cdf(double val) Return the cumulative density function at the given value.
double	logpdf(double val) Return the log density of an existing value
double	nextRandom() Generate a new random value
double	pdf(double val) Return the density of an existing value
double	pmf(double val) Probability mass function.
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: Distribution

Generate a new random value

Specified by:

nextRandom in interface Distribution

Returns:

new random value

pmf

public double pmf(double val)

Probability mass function.

Parameters:

val - Value

Returns:

probability mass pmf(val)

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

logpdf

public double logpdf(double val)

Description copied from interface: Distribution

Return the log density of an existing value

Specified by:

logpdf in interface Distribution

Parameters:

val - existing value

Returns:

log 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