jhplot.fit
Class Landau

java.lang.Object
  extended by hep.aida.ref.event.AIDAObservable
      extended by hep.aida.ref.ManagedObject
          extended by hep.aida.ref.function.AbstractIFunction
              extended by jhplot.fit.Landau
All Implemented Interfaces:
hep.aida.dev.IDevManagedObject, hep.aida.IFunction, hep.aida.IManagedObject, hep.aida.IModelFunction, hep.aida.ref.event.Connectable, hep.aida.ref.function.FunctionDispatcher, java.lang.Cloneable

public class Landau
extends hep.aida.ref.function.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)


Constructor Summary
Landau()
           
Landau(java.lang.String title)
           
Landau(java.lang.String[] variableNames, java.lang.String[] parameterNames)
           
 
Method Summary
 double value(double[] v)
           
 
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)
Specified by:
value in interface hep.aida.IFunction
Specified by:
value in class hep.aida.ref.function.AbstractIFunction


jHepWork 1.1 (C) Chekanov