Package elki.math.statistics.distribution

Class UniformDistribution

java.lang.Object

elki.math.statistics.distribution.UniformDistribution

All Implemented Interfaces:

Distribution

public class UniformDistribution
extends java.lang.Object
implements Distribution

Uniform distribution.

Since:

0.2

Author:

Erich Schubert

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	UniformDistribution.Par	Parameterization class

Nested classes/interfaces inherited from interface elki.math.statistics.distribution.Distribution

Distribution.Parameterizer

Field Summary

Fields

Modifier and Type	Field	Description
private double	len	Len := max - min
private double	max	Maximum
private double	min	Minimum

Constructor Summary

Constructors

Constructor	Description
UniformDistribution(double min, double max)	Constructor for a uniform distribution on the interval [min, max[

Method Summary

Modifier and Type	Method	Description
double	cdf(double val)	Return the cumulative density function at the given value.
double	getMax()
double	getMin()
double	logpdf(double val)	Return the log density of an existing value
double	nextRandom(java.util.Random random)	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.
java.lang.String	toString()	Describe the distribution

Methods inherited from class java.lang.Object

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

Field Detail

min

private double min

Minimum

max

private double max

Maximum

len

private double len

Len := max - min

Constructor Detail

UniformDistribution

public UniformDistribution(double min,
                           double max)

Constructor for a uniform distribution on the interval [min, max[

Parameters:

min - Minimum value

max - Maximum value

Method Detail

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

nextRandom

public double nextRandom(java.util.Random random)

Description copied from interface: Distribution

Generate a new random value

Specified by:

nextRandom in interface Distribution

Parameters:

random - Random number generator

Returns:

new random value

toString

public java.lang.String toString()

Description copied from interface: Distribution

Describe the distribution

Specified by:

toString in interface Distribution

Overrides:

toString in class java.lang.Object

Returns:

description

getMin

public double getMin()

Returns:

the minimum value

getMax

public double getMax()

Returns:

the maximum value