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

Class UniformDistribution

java.lang.Object

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

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

All Implemented Interfaces:

Distribution

public class UniformDistribution
extends AbstractDistribution

Uniform distribution.

Author:

Erich Schubert

Nested Class Summary

Nested Classes

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

Field Summary

Fields

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

Fields inherited from class de.lmu.ifi.dbs.elki.math.statistics.distribution.AbstractDistribution

random

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
double	cdf(double val) Return the cumulative density function at the given value.
double	getMax()
double	getMin()
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.
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,
                   RandomFactory random)

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

Parameters:

min - Minimum value

max - Maximum value

random - Random generator

UniformDistribution

public UniformDistribution(double min,
                   double max,
                   Random random)

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

Parameters:

min - Minimum value

max - Maximum value

random - Random generator

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

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.

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.

Parameters:

val - Quantile to find

Returns:

Quantile position

nextRandom

public double nextRandom()

Description copied from interface: Distribution

Generate a new random value

Specified by:

nextRandom in interface Distribution

Overrides:

nextRandom in class AbstractDistribution

Returns:

new random value

toString

public String toString()

Description copied from interface: Distribution

Describe the distribution

Specified by:

toString in interface Distribution

Overrides:

toString in class Object

Returns:

description

getMin

public double getMin()

Returns:

the minimum value

getMax

public double getMax()

Returns:

the maximum value