/usr/include/CLHEP/Random/RandGamma.h is in libclhep-dev 2.1.4.1-1.1.
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// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandGamma ---
// class header file
// -----------------------------------------------------------------------
// Class defining methods for shooting gamma distributed random values,
// given a k (default=1) and specifying also a lambda (default=1).
// Default values are used for operator()().
// Valid input values are k > 0 and lambda > 0. 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
// M Fischler - put and get to/from streams 12/10/04
// =======================================================================
#ifndef RandGamma_h
#define RandGamma_h 1
#include "CLHEP/Random/defs.h"
#include "CLHEP/Random/Random.h"
#include "CLHEP/Utility/memory.h"
namespace CLHEP {
/**
* @author
* @ingroup random
*/
class RandGamma : public HepRandom {
public:
inline RandGamma ( HepRandomEngine& anEngine, double k=1.0,
double lambda=1.0 );
inline RandGamma ( HepRandomEngine* anEngine, double k=1.0,
double lambda=1.0 );
// These constructors should be used to instantiate a RandGamma
// 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 RandGamma destructor.
// If the engine is passed by reference the corresponding engine object
// will not be deleted by the RandGamma destructor.
virtual ~RandGamma();
// Destructor
// Static methods to shoot random values using the static generator
static inline double shoot();
static double shoot( double k, double lambda );
static void shootArray ( const int size, double* vect,
double k=1.0, double lambda=1.0 );
// Static methods to shoot random values using a given engine
// by-passing the static generator.
static inline double shoot( HepRandomEngine* anEngine );
static double shoot( HepRandomEngine* anEngine,
double k, double lambda );
static void shootArray ( HepRandomEngine* anEngine, const int size,
double* vect, double k=1.0,
double lambda=1.0 );
// Methods using the localEngine to shoot random values, by-passing
// the static generator.
inline double fire();
double fire( double k, double lambda );
void fireArray ( const int size, double* vect);
void fireArray ( const int size, double* vect,
double k, double lambda );
inline double operator()();
inline double operator()( double k, double lambda );
// Save and restore to/from streams
std::ostream & put ( std::ostream & os ) const;
std::istream & get ( std::istream & is );
std::string name() const;
HepRandomEngine & engine();
static std::string distributionName() {return "RandGamma";}
// Provides the name of this distribution class
private:
static double genGamma( HepRandomEngine *anEngine, double k,
double lambda );
shared_ptr<HepRandomEngine> localEngine;
double defaultK;
double defaultLambda;
};
} // namespace CLHEP
#ifdef ENABLE_BACKWARDS_COMPATIBILITY
// backwards compatibility will be enabled ONLY in CLHEP 1.9
using namespace CLHEP;
#endif
#include "CLHEP/Random/RandGamma.icc"
#endif
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