math.cern

Class FastGamma

java.lang.Object

math.cern.FastGamma

public final class FastGamma
extends Object

Contains fast approximations for the Γ (Gamma) family of functions.

Implementation: High performance implementation.

This is a port of gen_fun.cpp from the C-RAND / WIN-RAND library.

Author:

wolfgang.hoschek@cern.ch

Method Summary

Modifier and Type	Method and Description
static double	gamma(double x) Returns a quick approximation of the gamma function gamma(x).
static double	logGamma(double x) Returns a quick approximation of log(gamma(x)).

Methods inherited from class java.lang.Object

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

Method Detail

gamma

public static double gamma(double x)

Returns a quick approximation of the gamma function gamma(x).

Parameters:

x - the value

Returns:

gamma(x)

logGamma

public static double logGamma(double x)

Returns a quick approximation of log(gamma(x)).

Parameters:

x - the value

Returns:

log(gamma(x))