Module ojalgo

Package org.ojalgo.function.special

Class GammaFunction.LanczosApproximation

java.lang.Object

org.ojalgo.function.special.GammaFunction.LanczosApproximation

Enclosing class:

GammaFunction

abstract static class GammaFunction.LanczosApproximation
extends java.lang.Object

Lanczos approximation. The abritray constant is 7, and there are 9 coefficients used.

 http://en.wikipedia.org/wiki/Lanczos_approximation
 http://mathworld.wolfram.com/LanczosApproximation.html
 https://mrob.com/pub/ries/lanczos-gamma.html
 

Field Summary

Fields

Modifier and Type	Field	Description
private static double	A	Arbitrary constant
private static double[]	C	Coefficients
private static double	LOG_SQRT_TWO_PI

Constructor Summary

Constructors

Constructor	Description
LanczosApproximation()

Method Summary

Modifier and Type	Method	Description
(package private) static double	gamma(double x)
(package private) static ComplexNumber	gamma(ComplexNumber z)
(package private) static double	logarithmic(double x)
(package private) static ComplexNumber	logarithmic(ComplexNumber z)

Methods inherited from class java.lang.Object

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

Field Detail

A

private static final double A

Arbitrary constant

C

private static final double[] C

Coefficients

LOG_SQRT_TWO_PI

private static final double LOG_SQRT_TWO_PI

Constructor Detail

LanczosApproximation

LanczosApproximation()

Method Detail

gamma

static ComplexNumber gamma(ComplexNumber z)

gamma

static double gamma(double x)

logarithmic

static ComplexNumber logarithmic(ComplexNumber z)

logarithmic

static double logarithmic(double x)