CLHEP/Random/RandChiSquare.h
// $Id: RandChiSquare.h,v 1.4 2000/04/17 22:59:54 mf Exp $
// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandChiSquare ---
// class header file
// -----------------------------------------------------------------------
// Class defining methods for shooting Chi^2 distributed random values,
// given a number of degrees of freedom a (default=1.0).
// Default values are used for operator()().
// Valid values of a satisfy a > 1. When invalid values are presented,
// the code silently returns -1.0.
// =======================================================================
// John Marraffino - Created: 12th May 1998 Based on the C-Rand package
// by Ernst Stadlober and Franz Niederl of the Technical
// University of Graz, Austria.
// Gabriele Cosmo - Removed useless methods and data: 5th Jan 1999
// =======================================================================
#ifndef RandChiSquare_h
#define RandChiSquare_h 1
#include "CLHEP/Random/Random.h"
class RandChiSquare : public HepRandom {
public:
inline RandChiSquare ( HepRandomEngine& anEngine, HepDouble a=1 );
inline RandChiSquare ( HepRandomEngine* anEngine, HepDouble a=1 );
// These constructors should be used to instantiate a RandChiSquare
// 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 RandChiSquare destructor.
// If the engine is passed by reference the corresponding engine object
// will not be deleted by the RandChiSquare destructor.
virtual ~RandChiSquare();
// Destructor
// Static methods to shoot random values using the static generator
static inline HepDouble shoot();
static HepDouble shoot( HepDouble a );
static void shootArray ( const HepInt size, HepDouble* vect,
HepDouble a=1.0 );
// Static methods to shoot random values using a given engine
// by-passing the static generator.
static inline HepDouble shoot( HepRandomEngine* anEngine );
static HepDouble shoot( HepRandomEngine* anEngine,
HepDouble a );
static void shootArray ( HepRandomEngine* anEngine, const HepInt size,
HepDouble* vect, HepDouble a=1.0 );
// Methods using the localEngine to shoot random values, by-passing
// the static generator.
inline HepDouble fire();
HepDouble fire( HepDouble a );
void fireArray ( const HepInt size, HepDouble* vect);
void fireArray ( const HepInt size, HepDouble* vect,
HepDouble a );
inline HepDouble operator()();
inline HepDouble operator()( HepDouble a );
private:
// Private copy constructor. Defining it here disallows use.
RandChiSquare(const RandChiSquare& d);
static HepDouble genChiSquare( HepRandomEngine *anEngine, HepDouble a );
HepRandomEngine* localEngine;
HepBoolean deleteEngine;
const HepDouble defaultA;
};
#include "CLHEP/Random/RandChiSquare.icc"
#endif
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