jhplot.fit

Class Landau

java.lang.Object

hep.aida.ref.event.AIDAObservable

hep.aida.ref.ManagedObject

hep.aida.ref.function.AbstractIFunction

jhplot.fit.Landau

All Implemented Interfaces:

IDevManagedObject, IFunction, IManagedObject, IModelFunction, Connectable, FunctionDispatcher, java.lang.Cloneable

public class Landau
extends AbstractIFunction

The function represents the Landau distribution. This class represents a Landau distribution, as approximated by the Moyal formula \[ Moyal(\lambda) = \frac{\exp{-0.5(\lambda+\exp{-\lambda})}}{\sqrt{2\pi}} \] See J.E. Moyal, Theory of ionization fluctuations, Phil. Mag. 46 (1955) 263. Note that this analytical approximation is too low in the tail. In order to allow for a fit, we define \[ \lambda = \frac{x - m}{s} \] with x the dataset variable. From Goddard GLAST ACD team (Fortran version)

Field Summary

Fields inherited from class hep.aida.ref.function.AbstractIFunction

gradient, p

Constructor Summary

Constructors

Constructor and Description
Landau()
Landau(java.lang.String title)
Landau(java.lang.String[] variableNames, java.lang.String[] parameterNames)

Method Summary

Modifier and Type	Method and Description
double	value(double[] v) Provide value for your function here.

Methods inherited from class hep.aida.ref.function.AbstractIFunction

addFunctionListener, annotation, clone, codeletString, dimension, excludeNormalizationAll, gradient, includeNormalizationAll, indexOfParameter, isEqual, isNormalized, normalizationParameter, normalizationRange, normalize, numberOfParameters, parameter, parameterGradient, parameterNames, parameters, providesGradient, providesNormalization, providesParameterGradient, removeFunctionListener, setCodeletString, setParameter, setParameters, setTitle, title, variableName, variableNames

Methods inherited from class hep.aida.ref.ManagedObject

isFillable, name, setFillable, setName, type, typeForClass

Methods inherited from class hep.aida.ref.event.AIDAObservable

addListener, isConnected, removeAllListeners, removeListener, setConnected, setValid, setValidForAll

Methods inherited from class java.lang.Object

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

Methods inherited from interface hep.aida.ref.event.Connectable

isConnected, setConnected

Constructor Detail

Landau

public Landau()

Landau

public Landau(java.lang.String title)

Landau

public Landau(java.lang.String[] variableNames,
              java.lang.String[] parameterNames)

Method Detail

value

public double value(double[] v)

Description copied from class: AbstractIFunction

Provide value for your function here. Something like: return p[0]+p[1]*v[0]+p[2]*v[0]*v[0];

Specified by:

value in interface IFunction

Specified by:

value in class AbstractIFunction