Package dev.nm.analysis.function.special.beta

Class LogBeta

java.lang.Object

dev.nm.analysis.function.rn2r1.AbstractRealScalarFunction

dev.nm.analysis.function.rn2r1.AbstractBivariateRealFunction

dev.nm.analysis.function.special.beta.LogBeta

All Implemented Interfaces:

Function<Vector,Double>, BivariateRealFunction, RealScalarFunction

public class LogBeta
extends AbstractBivariateRealFunction

This class represents the log of Beta function log(B(x, y)).

                       Γ(x)Γ(y)
 log(B(x, y)) = log ( ----------- ) = logΓ(x) + logΓ(y) - logΓ(x + y)
                        Γ(x+y)
 

x > 0, y > 0

The R equivalent function is lbeta.

See Also:

• Wikipedia: Beta function

Nested Class Summary

Nested classes/interfaces inherited from interface dev.nm.analysis.function.Function

Function.EvaluationException

Constructor Summary

Constructors

Constructor	Description
LogBeta()

Method Summary

Modifier and Type	Method	Description
double	evaluate(double x, double y)	Compute log(B(x,y)).

Methods inherited from class dev.nm.analysis.function.rn2r1.AbstractBivariateRealFunction

evaluate

Methods inherited from class dev.nm.analysis.function.rn2r1.AbstractRealScalarFunction

dimensionOfDomain, dimensionOfRange

Methods inherited from class java.lang.Object

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

Methods inherited from interface dev.nm.analysis.function.Function

dimensionOfDomain, dimensionOfRange

Constructor Details

LogBeta

public LogBeta()

Method Details

evaluate

public double evaluate(double x,
 double y)

Compute log(B(x,y)).

Parameters:

x - x >= 0

y - y >= 0

Returns:

log(B(x,y))