CLHEP/Random/RandPoisson.h
// $Id: RandPoisson.h,v 1.10 2000/04/17 23:00:16 mf Exp $
// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandPoisson ---
// class header file
// -----------------------------------------------------------------------
// This file is part of Geant4 (simulation toolkit for HEP).
// Class defining methods for shooting numbers according to the Poisson
// distribution, given a mean (Algorithm taken from "W.H.Press et al.,
// Numerical Recipes in C, Second Edition".
// Default mean value is set to 1, value used for operator()().
// =======================================================================
// Gabriele Cosmo - Created: 5th September 1995
// - Added not static Shoot() method: 17th May 1996
// - Algorithm now operates on doubles : 31st Oct 1996
// - Added methods to shoot arrays: 28th July 1997
// J.Marraffino - Added default mean as attribute and
// operator() with mean: 16th Feb 1998
// Gabriele Cosmo - Relocated static data from HepRandom: 5th Jan 1999
// M. Fischler - Moved meanMax and defaultMean from private to protected
// to accomodate derived classes RandPoissonQ & RandPoissonT
// =======================================================================
#ifndef RandPoisson_h
#define RandPoisson_h 1
#include "CLHEP/Random/Random.h"
class RandPoisson : public HepRandom {
public:
inline RandPoisson ( HepRandomEngine& anEngine, HepDouble m=1.0 );
inline RandPoisson ( HepRandomEngine* anEngine, HepDouble m=1.0 );
// These constructors should be used to instantiate a RandPoisson
// 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 RandPoisson destructor.
// If the engine is passed by reference the corresponding engine object
// will not be deleted by the RandPoisson destructor.
virtual ~RandPoisson();
// Destructor
// Static methods to shoot random values using the static generator
static long shoot( HepDouble m=1.0 );
static void shootArray ( const HepInt size, long* vect, HepDouble m=1.0 );
// Static methods to shoot random values using a given engine
// by-passing the static generator.
static long shoot( HepRandomEngine* anEngine, HepDouble m=1.0 );
static void shootArray ( HepRandomEngine* anEngine,
const HepInt size, long* vect, HepDouble m=1.0 );
// Methods using the localEngine to shoot random values, by-passing
// the static generator.
long fire();
long fire( HepDouble m );
void fireArray ( const HepInt size, long* vect );
void fireArray ( const HepInt size, long* vect, HepDouble m);
HepDouble operator()();
HepDouble operator()( HepDouble m );
protected:
// Protected copy constructor. Defining it here disallows user use.
RandPoisson(const RandPoisson& d);
const HepDouble meanMax;
const HepDouble defaultMean;
static HepDouble getOldMean() {return oldm_st;}
static HepDouble getMaxMean() {return meanMax_st;}
static void setOldMean( HepDouble val ){oldm_st = val;}
static HepDouble* getPStatus() {return status_st;}
static void setPStatus(HepDouble sq, HepDouble alxm, HepDouble g) {
status_st[0] = sq; status_st[1] = alxm; status_st[2] = g;
}
inline HepRandomEngine* getLocalEngine();
private:
HepRandomEngine* localEngine;
HepBoolean deleteEngine;
HepDouble status[3], oldm;
// static data
static HepDouble status_st[3];
static HepDouble oldm_st;
static const HepDouble meanMax_st;
};
#include "CLHEP/Random/RandPoisson.icc"
#endif
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