CLHEP/Random/RandStudentT.h
// $Id: RandStudentT.h,v 1.4 2000/04/17 23:00:21 mf Exp $
// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandStudentT ---
// class header file
// -----------------------------------------------------------------------
// Class defining methods for shooting Student's t- distributed random
// values, given a number of degrees of freedom a (default=1.0).
// Default values are used for operator()().
// Valid input values are a > 0. When invalid values are presented, the
// code silently returns HUGE_VAL from <math.h> which is the same as
// MAXDOUBLE in <values.h> on systems where the latter exists.
// =======================================================================
// John Marraffino - Created: Based on the C-Rand package
// by Ernst Stadlober and Franz Niederl of the Technical
// University of Graz, Austria : 12th May 1998
// - Removed <values.h> because that won't work
// on NT : 26th Jun 1998
// Gabriele Cosmo - Fixed minor bug on inline definition for shoot()
// methods. Created .icc file : 20th Aug 1998
// - Removed useless methods and data: 5th Jan 1999
// =======================================================================
#ifndef RandStudentT_h
#define RandStudentT_h 1
#include "CLHEP/Random/Random.h"
class RandStudentT : public HepRandom {
public:
inline RandStudentT ( HepRandomEngine& anEngine, HepDouble a=1.0 );
inline RandStudentT ( HepRandomEngine* anEngine, HepDouble a=1.0 );
// These constructors should be used to instantiate a RandStudentT
// 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 RandStudentT destructor.
// If the engine is passed by reference the corresponding engine object
// will not be deleted by the RandStudentT destructor.
virtual ~RandStudentT();
// 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 );
HepDouble operator()();
HepDouble operator()( HepDouble a );
private:
// Private copy constructor. Defining it here disallows use.
RandStudentT(const RandStudentT& d);
HepRandomEngine* localEngine;
HepBoolean deleteEngine;
const HepDouble defaultA;
};
#include "CLHEP/Random/RandStudentT.icc"
#endif
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