net.sf.javaml.utils
Class GammaFunction

java.lang.Object
  net.sf.javaml.utils.GammaFunction

public class GammaFunction
extends java.lang.Object

Constructor Summary

GammaFunction()

Method Summary

static double	gamma(double x) Returns the Gamma function of the argument.
static double	logGamma(double x) Returns the natural logarithm of the gamma function; formerly named lgamma.
static double	stirlingFormula(double x) Returns the Gamma function computed by Stirling's formula; formerly named stirf.

Methods inherited from class java.lang.Object

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

Constructor Detail

GammaFunction

public GammaFunction()

Method Detail

stirlingFormula

public static double stirlingFormula(double x)
                              throws java.lang.ArithmeticException

Returns the Gamma function computed by Stirling's formula; formerly named stirf. The polynomial STIR is valid for 33 <= x <= 172.

Throws:

java.lang.ArithmeticException

gamma

public static double gamma(double x)
                    throws java.lang.ArithmeticException

Returns the Gamma function of the argument.

Throws:

java.lang.ArithmeticException

logGamma

public static double logGamma(double x)
                       throws java.lang.ArithmeticException

Returns the natural logarithm of the gamma function; formerly named lgamma.

Throws:

java.lang.ArithmeticException