de.uka.ipd.sdq.simucomframework.variables.functions

Class GammaDistFunctionFromMoments

java.lang.Object

de.uka.ipd.sdq.simucomframework.variables.functions.AbstractProbDistFunction

de.uka.ipd.sdq.simucomframework.variables.functions.GammaDistFunctionFromMoments

All Implemented Interfaces:

IFunction

public class GammaDistFunctionFromMoments
extends AbstractProbDistFunction

Gamma distribution with shape alpha > 0 and inverse scale parameter beta > 0 There is another way to write the gamma function with k = alpha and theta = 1/beta,

Field Summary

Fields inherited from class de.uka.ipd.sdq.simucomframework.variables.functions.AbstractProbDistFunction

factory, randomGen

Constructor Summary

Constructors

Constructor and Description
GammaDistFunctionFromMoments(de.uka.ipd.sdq.probfunction.math.IRandomGenerator randomGen, de.uka.ipd.sdq.probfunction.math.IPDFFactory factory)

Method Summary

Modifier and Type	Method and Description
boolean	checkParameters(java.util.List<java.lang.Object> parameters) Checks the validity of the parameter.
java.lang.Object	evaluate(java.util.List<java.lang.Object> parameters) Evaluate the functions result using the parameters given

Methods inherited from class java.lang.Object

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

Constructor Detail

GammaDistFunctionFromMoments

public GammaDistFunctionFromMoments(de.uka.ipd.sdq.probfunction.math.IRandomGenerator randomGen,
                                    de.uka.ipd.sdq.probfunction.math.IPDFFactory factory)

Method Detail

checkParameters

public boolean checkParameters(java.util.List<java.lang.Object> parameters)

Checks the validity of the parameter. GammaDistFunctionFromMoments takes two parameters mean and c coefficient of variance mean needs to be larger than 0. c needs to be larger than 0.

Parameters:

parameters - A set of parameters to be processed

Returns:

true if the parameters fit to the functions preconditions, false otherwise

evaluate

public java.lang.Object evaluate(java.util.List<java.lang.Object> parameters)

Description copied from interface: IFunction

Evaluate the functions result using the parameters given

Parameters:

parameters - Parameters for the function

Returns:

Value of the function