jhplot.fit
Class Landau
- All Implemented Interfaces:
- IDevManagedObject, IFunction, IManagedObject, IModelFunction, Connectable, FunctionDispatcher, Cloneable
public class Landauextends 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(String title)
Landau(String[] variableNames, String[] parameterNames)
Method Summary
All Methods Instance Methods Concrete Methods 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(String title)
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 interfaceIFunction
- Specified by:
value
in classAbstractIFunction
DMelt 2.7 © DataMelt by jWork.ORG