com.opengamma.strata.math.impl.function.special

Class GammaFunction

java.lang.Object

com.opengamma.strata.math.impl.function.special.GammaFunction

All Implemented Interfaces:

DoubleUnaryOperator

public class GammaFunction
extends Object
implements DoubleUnaryOperator

The gamma function is a generalization of the factorial to complex and real numbers. It is defined by the integral: $$ \begin{equation*} \Gamma(z)=\int_0^\infty t^{z-1}e^{-t}dt \end{equation*} $$ and is related to the factorial by $$ \begin{equation*} \Gamma(n+1)=n! \end{equation*} $$ It is analytic everywhere but $z=0, -1, -2, \ldots$

This class is a wrapper for the Commons Math library implementation of the Gamma function.

Constructor Summary

Constructors

Constructor and Description
GammaFunction()

Method Summary

Modifier and Type	Method and Description
double	applyAsDouble(double x)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.DoubleUnaryOperator

andThen, compose, identity

Constructor Detail

GammaFunction

public GammaFunction()

Method Detail

applyAsDouble

public double applyAsDouble(double x)

Specified by:

applyAsDouble in interface DoubleUnaryOperator