CLHEP/Random/RandLandau.h
// $Id: RandLandau.h,v 1.2 2000/04/17 23:00:13 mf Exp $
// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandLandau ---
// class header file
// -----------------------------------------------------------------------
// This file is part of Geant4 (simulation toolkit for HEP).
// Class defining methods for shooting or firing Landau distributed
// random values.
//
// The Landau distribution is parameterless and describes the fluctuations
// in energy loss of a particle, making certain assumptions. For
// definitions and algorithms, the following papers could be read:
//
// Landau, Jour Phys VIII, No. 4, p. 201 (1944)
// Borsh-Supan, Jour Res. of NBS 65B NO. 4 p. 245 (1961)
// Kolbig & Schorr Comp Phys Comm 31 p. 97 (1984)
//
// The algorithm implemented comes form RANLAN in CERNLIB.
// =======================================================================
// M. Fischler - Created: 5th January 2000
//
// =======================================================================
#ifndef RandLandau_h
#define RandLandau_h 1
#include "CLHEP/Random/Random.h"
class RandLandau : public HepRandom {
public:
inline RandLandau ( HepRandomEngine& anEngine );
inline RandLandau ( HepRandomEngine* anEngine );
// These constructors should be used to instantiate a RandLandau
// distribution object defining a local engine for it.
// The static generator will be skipped using the non-static methods
// defined below.
// If the engine is passed by pointer the corresponding engine object
// will be deleted by the RandLandau destructor.
// If the engine is passed by reference the corresponding engine object
// will not be deleted by the RandLandau destructor.
virtual ~RandLandau();
// Destructor
//
// Methods to generate Landau-distributed random deviates.
//
// These deviates are accurate to the actual Landau distribution to
// one part in 10**5 or better.
// Static methods to shoot random values using the static generator
static inline HepDouble shoot();
static void shootArray ( const HepInt size, HepDouble* vect );
// Static methods to shoot random values using a given engine
// by-passing the static generator.
static inline HepDouble shoot( HepRandomEngine* anotherEngine );
static void shootArray ( HepRandomEngine* anotherEngine,
const HepInt size,
HepDouble* vect );
// Instance methods using the localEngine to instead of the static
// generator, and the default mean and stdDev established at construction
inline HepDouble fire();
void fireArray ( const HepInt size, HepDouble* vect);
inline HepDouble operator()();
protected:
static HepDouble transform (HepDouble r);
static HepDouble transformSmall (HepDouble r);
private:
// Private copy constructor. Defining it here disallows use.
RandLandau(const RandLandau& d);
HepRandomEngine* localEngine;
HepBoolean deleteEngine;
};
#include "CLHEP/Random/RandLandau.icc"
#endif
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