Gabriele Cosmo
109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
// $Id:$
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// -*- C++ -*-
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//
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// -----------------------------------------------------------------------
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// HEP Random
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// --- HepJamesRandom ---
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// class header file
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// -----------------------------------------------------------------------
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// This file is part of Geant4 (simulation toolkit for HEP).
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//
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// HepJamesRandom implements the algorithm by Marsaglia-Zaman RANMAR
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// described in "F.James, Comp. Phys. Comm. 60 (1990) 329" and implemented
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// in FORTRAN77 as part of the MATHLIB HEP library for pseudo-random
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// numbers generation.
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// This is the default random engine invoked by each distribution unless
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// the user sets a different one.
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// =======================================================================
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// Gabriele Cosmo - Created: 5th September 1995
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// - Minor corrections: 31st October 1996
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// - Added methods for engine status: 19th November 1996
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// - setSeed(), setSeeds() now have default dummy argument
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// set to zero: 11th July 1997
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// J.Marraffino - Added stream operators and related constructor.
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// Added automatic seed selection from seed table and
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// engine counter: 16th Feb 1998
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// Ken Smith - Added conversion operators: 6th Aug 1998
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// V. Innocente - changed pointers to indices 3 may 2000
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// Mark Fischler - Methods for distrib. instance save/restore 12/8/04
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// Mark Fischler methods for anonymous save/restore 12/27/04
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// =======================================================================
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#ifndef HepJamesRandom_h
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#define HepJamesRandom_h 1
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#include "CLHEP/Random/RandomEngine.h"
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namespace CLHEP {
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/**
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* @author
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* @ingroup random
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*/
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class HepJamesRandom: public HepRandomEngine {
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public:
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HepJamesRandom(std::istream& is);
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HepJamesRandom();
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HepJamesRandom(long seed);
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HepJamesRandom(int rowIndex, int colIndex);
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virtual ~HepJamesRandom();
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// Constructor and destructor.
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double flat();
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// Returns a pseudo random number between 0 and 1
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// (excluding the end points)
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void flatArray (const int size, double* vect);
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// Fills the array "vect" of specified size with flat random values.
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void setSeed(long seed, int dum=0);
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// Sets the state of the algorithm according to seed.
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void setSeeds(const long * seeds, int dum=0);
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// Sets the state of the algorithm according to the zero terminated
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// array of seeds. Only the first seed is used.
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void saveStatus( const char filename[] = "JamesRand.conf" ) const;
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// Saves on file JamesRand.conf the current engine status.
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void restoreStatus( const char filename[] = "JamesRand.conf" );
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// Reads from file JamesRand.conf the last saved engine status
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// and restores it.
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void showStatus() const;
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// Dumps the engine status on the screen.
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operator unsigned int();
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// 32-bit flat, but slower than double or float.
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virtual std::ostream & put (std::ostream & os) const;
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virtual std::istream & get (std::istream & is);
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static std::string beginTag ( );
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virtual std::istream & getState ( std::istream & is );
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std::string name() const;
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static std::string engineName() {return "HepJamesRandom";}
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std::vector<unsigned long> put () const;
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bool get (const std::vector<unsigned long> & v);
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bool getState (const std::vector<unsigned long> & v);
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static const unsigned int VECTOR_STATE_SIZE = 202;
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private:
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// Members defining the current status of the generator.
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double u[97];
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double c, cd, cm;
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int i97, j97;
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static int numEngines;
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static int maxIndex;
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};
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} // namespace CLHEP
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#endif
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