IRPact_modellierung.distributions

Class ZipfianDistribution

java.lang.Object

IRPact_modellierung.distributions.Distribution

IRPact_modellierung.distributions.UnivariateDistribution

IRPact_modellierung.distributions.DiscreteDistribution

IRPact_modellierung.distributions.COLTDiscreteDistribution

IRPact_modellierung.distributions.ZipfianDistribution

public class ZipfianDistribution
extends COLTDiscreteDistribution

Class to model a zipfian distribution based on the COLT library. Models contexts that follow the Zipfian law

Field Summary

Fields inherited from class IRPact_modellierung.distributions.COLTDiscreteDistribution

generator

Fields inherited from class IRPact_modellierung.distributions.Distribution

name

Constructor Summary

Constructors

Constructor and Description
ZipfianDistribution(java.lang.String name, double z) Creates an instance of a Zipfian distribution based on the COLT library.

Method Summary

Modifier and Type	Method and Description
double	draw() Draw a value from the distribution according to the distribution at hand
double	getZ()

Methods inherited from class IRPact_modellierung.distributions.Distribution

getName, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ZipfianDistribution

public ZipfianDistribution(java.lang.String name,
                           double z)
                    throws java.lang.IllegalArgumentException

Creates an instance of a Zipfian distribution based on the COLT library. Needs a skew larger than unity of the skew of the distribution it is to model

Parameters:

name - The name of the distribution (will be prefixed by ZipfianDistribution_)

z - The skew of the distribution to model

Throws:

java.lang.IllegalArgumentException - An exception is thrown when the skew of the distribution is not larger than unity, since otherwise the COLT distribution won't terminate

Method Detail

getZ

public double getZ()

draw

public double draw()

Description copied from class: UnivariateDistribution

Draw a value from the distribution according to the distribution at hand

Specified by:

draw in class UnivariateDistribution

Returns:

A double number drawn from the modeled distribution