org.ojalgo.random

Class Exponential

java.lang.Object

java.lang.Number

org.ojalgo.random.RandomNumber

org.ojalgo.random.Exponential

All Implemented Interfaces:

Serializable, DoubleSupplier, Supplier<Double>, BasicFunction, NullaryFunction<Double>, ContinuousDistribution, Distribution

public class Exponential
extends RandomNumber

Distribution of length of life when no aging. Describes the time between events in a Poisson process, i.e. a process in which events occur continuously and independently at a constant average rate. It is the continuous analogue of the geometric distribution.

Author:

apete

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.ojalgo.function.BasicFunction

BasicFunction.Differentiable<N extends Number,F extends BasicFunction>, BasicFunction.Integratable<N extends Number,F extends BasicFunction>, BasicFunction.PlainUnary<T,R>

Constructor Summary

Constructors

Constructor and Description
Exponential()
Exponential(double aRate)

Method Summary

Modifier and Type	Method and Description
protected double	generate()
double	getDensity(double value) In probability theory, a probability density function (pdf), or density of a continuous random variable is a function that describes the relative likelihood for this random variable to occur at a given point.
double	getDistribution(double value) In probability theory and statistics, the cumulative distribution function (CDF), or just distribution function, describes the probability that a real-valued random variable X with a given probability distribution will be found at a value less than or equal to x.
double	getExpected()
double	getLowerConfidenceQuantile(double confidence)
double	getQuantile(double probability) The quantile function, for any distribution, is defined for real variables between zero and one and is mathematically the inverse of the cumulative distribution function.
double	getStandardDeviation() Subclasses must override either getStandardDeviation() or getVariance()!
double	getUpperConfidenceQuantile(double confidence)

Methods inherited from class org.ojalgo.random.RandomNumber

checkProbabilty, doubleValue, floatValue, getVariance, intValue, invoke, longValue, newSampleSet, random, setSeed, toString

Methods inherited from class java.lang.Number

byteValue, shortValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ojalgo.random.ContinuousDistribution

getProbability

Methods inherited from interface org.ojalgo.random.Distribution

getVariance

Methods inherited from interface org.ojalgo.function.NullaryFunction

andThen, get, getAsDouble

Constructor Detail

Exponential

public Exponential()

Exponential

public Exponential(double aRate)

Method Detail

getDensity

public double getDensity(double value)

Description copied from interface: ContinuousDistribution

In probability theory, a probability density function (pdf), or density of a continuous random variable is a function that describes the relative likelihood for this random variable to occur at a given point. The probability for the random variable to fall within a particular region is given by the integral of this variable's density over the region. The probability density function is nonnegative everywhere, and its integral over the entire space is equal to one. WikipediA

Parameters:

value - x

Returns:

P(x)

getDistribution

public double getDistribution(double value)

Description copied from interface: ContinuousDistribution

In probability theory and statistics, the cumulative distribution function (CDF), or just distribution function, describes the probability that a real-valued random variable X with a given probability distribution will be found at a value less than or equal to x. Intuitively, it is the "area so far" function of the probability distribution. Cumulative distribution functions are also used to specify the distribution of multivariate random variables. WikipediA

Parameters:

value - x

Returns:

P(≤x)

getExpected

public double getExpected()

getQuantile

public double getQuantile(double probability)

Description copied from interface: ContinuousDistribution

The quantile function, for any distribution, is defined for real variables between zero and one and is mathematically the inverse of the cumulative distribution function. WikipediA The input probability absolutely has to be [0.0, 1.0], but values close to 0.0 and 1.0 may be problematic

Parameters:

probability - P(<=x)

Returns:

x

getStandardDeviation

public double getStandardDeviation()

Description copied from class: RandomNumber

Subclasses must override either getStandardDeviation() or getVariance()!

Specified by:

getStandardDeviation in interface Distribution

Overrides:

getStandardDeviation in class RandomNumber

See Also:

Distribution.getStandardDeviation(), Distribution.getVariance()

generate

protected double generate()

getLowerConfidenceQuantile

public final double getLowerConfidenceQuantile(double confidence)

getUpperConfidenceQuantile

public final double getUpperConfidenceQuantile(double confidence)