/usr/include/CLHEP/Random/RanecuEngine.h is in libclhep-dev 2.1.4.1+dfsg-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | // $Id: RanecuEngine.h,v 1.6 2010/07/20 18:06:02 garren Exp $
// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RanecuEngine ---
// class header file
// -----------------------------------------------------------------------
// This file is part of Geant4 (simulation toolkit for HEP).
//
// RANECU Random Engine - algorithm originally written in FORTRAN77
// as part of the MATHLIB HEP library.
// The initialisation is carried out using a Multiplicative Congruential
// generator using formula constants of L'Ecuyer as described in "F.James,
// Comp. Phys. Comm. 60 (1990) 329-344".
// Seeds are taken from a seed table given an index, the getSeed() method
// returns the current index in the seed table, the getSeeds() method
// returns a pointer to the couple of seeds stored in the local table of
// seeds at the current index.
// =======================================================================
// Gabriele Cosmo - Created: 2nd February 1996
// - Minor corrections: 31st October 1996
// - Added methods for engine status: 19th November 1996
// - setSeed() now has default dummy argument
// set to zero: 11th July 1997
// - Added default index to setSeeds(): 16th Oct 1997
// J.Marraffino - Added stream operators and related constructor.
// Added automatic seed selection from seed table and
// engine counter: 16th Feb 1998
// Ken Smith - Added conversion operators: 6th Aug 1998
// Mark Fischler Methods for distrib. instance save/restore 12/8/04
// Mark Fischler methods for anonymous save/restore 12/27/04
// =======================================================================
#ifndef RanecuEngine_h
#define RanecuEngine_h 1
#include "CLHEP/Random/defs.h"
#include "CLHEP/Random/RandomEngine.h"
namespace CLHEP {
/**
* @author <Gabriele.Cosmo@cern.ch>
* @ingroup random
*/
class RanecuEngine : public HepRandomEngine {
public:
RanecuEngine(std::istream& is);
RanecuEngine();
RanecuEngine(int index);
virtual ~RanecuEngine();
// Constructors and destructor.
double flat();
// Returns a pseudo random number between 0 and 1
// (excluding the end points)
void flatArray (const int size, double* vect);
// Fills an array "vect" of specified size with flat random values.
void setIndex (long index);
// Sets the state of the algorithm according to "index", the position
// in the local table of seeds.
void setSeed (long index, int dum=0);
// Resets the state of the algorithm according to "index", the position
// in the static table of seeds stored in HepRandom.
void setSeeds (const long* seeds, int index=-1);
// Sets the state of the algorithm according to the array of seeds
// "seeds" containing two seed values to be stored in the local table at
// "index" position.
void saveStatus( const char filename[] = "Ranecu.conf" ) const;
// Saves on file Ranecu.conf the current engine status.
void restoreStatus( const char filename[] = "Ranecu.conf" );
// Reads from file Ranecu.conf the last saved engine status
// and restores it.
void showStatus() const;
// Dumps the engine status on the screen.
operator unsigned int();
// 32-bit int flat, faster in this case
virtual std::ostream & put (std::ostream & os) const;
virtual std::istream & get (std::istream & is);
static std::string beginTag ( );
virtual std::istream & getState ( std::istream & is );
std::string name() const;
static std::string engineName() {return "RanecuEngine";}
std::vector<unsigned long> put () const;
bool get (const std::vector<unsigned long> & v);
bool getState (const std::vector<unsigned long> & v);
protected:
// Suggested L'ecuyer coefficients for portable 32 bits generators.
static const int ecuyer_a = 40014;
static const int ecuyer_b = 53668;
static const int ecuyer_c = 12211;
static const int ecuyer_d = 40692;
static const int ecuyer_e = 52774;
static const int ecuyer_f = 3791;
static const int shift1 = 2147483563;
static const int shift2 = 2147483399;
static const unsigned int VECTOR_STATE_SIZE = 4;
private:
// private method used to mitigate the effects of using a lookup table
void further_randomize (int seq, int col, int index, int modulus);
// Members defining the current state of the generator.
static const int maxSeq = 215;
long table[215][2];
int seq;
static int numEngines;
};
} // namespace CLHEP
#ifdef ENABLE_BACKWARDS_COMPATIBILITY
// backwards compatibility will be enabled ONLY in CLHEP 1.9
using namespace CLHEP;
#endif
#endif
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