| Geant4 Cross Reference |
1 // -*- C++ -*- 1 // -*- C++ -*-
2 // 2 //
3 // ------------------------------------------- 3 // -----------------------------------------------------------------------
4 // HEP Random 4 // HEP Random
5 // --- Ranlux64Engine - 5 // --- Ranlux64Engine ---
6 // class header file 6 // class header file
7 // ------------------------------------------- 7 // -----------------------------------------------------------------------
8 // The algorithm for this random engine has be 8 // The algorithm for this random engine has been taken from the notes of
9 // a double-precision ranlux implementation by 9 // a double-precision ranlux implementation by Martin Luscher, dated
10 // November 1997. 10 // November 1997.
11 // 11 //
12 // Like the previous ranlux generator, this on 12 // Like the previous ranlux generator, this one also has "luxury" levels,
13 // determining how many pseudo-random numbers 13 // determining how many pseudo-random numbers are discarded for every
14 // twelve values used. Three levels are given, 14 // twelve values used. Three levels are given, with the note that Luscher
15 // himself advocates only the highest two leve 15 // himself advocates only the highest two levels for this engine.
16 // level 0 (p=109): Throw away 16 // level 0 (p=109): Throw away 109 values for every 12 used
17 // level 1 (p=202): (default) Throw away 17 // level 1 (p=202): (default) Throw away 202 values for every 12 used
18 // level 2 (p=397): Throw away 18 // level 2 (p=397): Throw away 397 values for every 12 used
19 // 19 //
20 // The initialization is carried out using a M 20 // The initialization is carried out using a Multiplicative Congruential
21 // generator using formula constants of L'Ecuy 21 // generator using formula constants of L'Ecuyer as described in "F.James,
22 // Comp. Phys. Comm. 60 (1990) 329-344". 22 // Comp. Phys. Comm. 60 (1990) 329-344".
23 // =========================================== 23 // =======================================================================
24 // Ken Smith - Created Initial draft: 14t 24 // Ken Smith - Created Initial draft: 14th Jul 1998
25 // - Added conversion operators 25 // - Added conversion operators: 6th Aug 1998
26 // Mark Fischler 26 // Mark Fischler
27 // 9/9/98 - Added update() routine to allow 27 // 9/9/98 - Added update() routine to allow computation of many at once
28 // - Replaced algorithm with jone exactly 28 // - Replaced algorithm with jone exactly matching Luscher:
29 // 48-bits generated 29 // 48-bits generated
30 // skip n-12 instead of n numbers 30 // skip n-12 instead of n numbers
31 // - Corrected protection agains overflow 31 // - Corrected protection agains overflow
32 // 12/8/04 - Methods for instance save/ 32 // 12/8/04 - Methods for instance save/restore
33 // 12/27/04 - methods for anonymous save 33 // 12/27/04 - methods for anonymous save/restore 12/27/04
34 // 34 //
35 // =========================================== 35 // =======================================================================
36 36
37 #ifndef Ranlux64Engine_h 37 #ifndef Ranlux64Engine_h
38 #define Ranlux64Engine_h 38 #define Ranlux64Engine_h
39 39
40 #include "CLHEP/Random/RandomEngine.h" 40 #include "CLHEP/Random/RandomEngine.h"
41 41
42 namespace CLHEP { 42 namespace CLHEP {
43 43
44 /** 44 /**
45 * @author 45 * @author
46 * @ingroup random 46 * @ingroup random
47 */ 47 */
48 class Ranlux64Engine : public HepRandomEngine 48 class Ranlux64Engine : public HepRandomEngine {
49 49
50 public: 50 public:
51 51
52 Ranlux64Engine( std::istream& is ); 52 Ranlux64Engine( std::istream& is );
53 Ranlux64Engine(); 53 Ranlux64Engine();
54 Ranlux64Engine( long seed, int lxr = 1 ); 54 Ranlux64Engine( long seed, int lxr = 1 );
55 Ranlux64Engine( int rowIndex, int colIndex, 55 Ranlux64Engine( int rowIndex, int colIndex, int lxr );
56 virtual ~Ranlux64Engine(); 56 virtual ~Ranlux64Engine();
57 // Constructors and destructor 57 // Constructors and destructor
58 58
59 double flat(); 59 double flat();
60 // It returns a pseudo random number between 60 // It returns a pseudo random number between 0 and 1,
61 // excluding the end points. 61 // excluding the end points.
62 62
63 void flatArray (const int size, double* vect 63 void flatArray (const int size, double* vect);
64 // Fills the array "vect" of specified size 64 // Fills the array "vect" of specified size with flat random values.
65 65
66 void setSeed(long seed, int lxr=1); 66 void setSeed(long seed, int lxr=1);
67 // Sets the state of the algorithm according 67 // Sets the state of the algorithm according to seed.
68 68
69 void setSeeds(const long * seeds, int lxr=1) 69 void setSeeds(const long * seeds, int lxr=1);
70 // Sets the state of the algorithm according 70 // Sets the state of the algorithm according to the zero terminated
71 // array of seeds. Only the first seed is u 71 // array of seeds. Only the first seed is used.
72 72
73 void saveStatus( const char filename[] = "Ra 73 void saveStatus( const char filename[] = "Ranlux64.conf" ) const;
74 // Saves in named file the current engine st 74 // Saves in named file the current engine status.
75 75
76 void restoreStatus( const char filename[] = 76 void restoreStatus( const char filename[] = "Ranlux64.conf" );
77 // Reads from named file the last saved engi 77 // Reads from named file the last saved engine status and restores it.
78 78
79 void showStatus() const; 79 void showStatus() const;
80 // Dumps the engine status on the screen. 80 // Dumps the engine status on the screen.
81 81
82 int getLuxury() const { return luxury; } 82 int getLuxury() const { return luxury; }
83 // Gets the luxury level. 83 // Gets the luxury level.
84 84
85 virtual std::ostream & put (std::ostream & o 85 virtual std::ostream & put (std::ostream & os) const;
86 virtual std::istream & get (std::istream & i 86 virtual std::istream & get (std::istream & is);
87 static std::string beginTag ( ); 87 static std::string beginTag ( );
88 virtual std::istream & getState ( std::istre 88 virtual std::istream & getState ( std::istream & is );
89 89
90 std::string name() const; 90 std::string name() const;
91 static std::string engineName() {return "Ran 91 static std::string engineName() {return "Ranlux64Engine";}
92 92
93 std::vector<unsigned long> put () const; 93 std::vector<unsigned long> put () const;
94 bool get (const std::vector<unsigned long> & 94 bool get (const std::vector<unsigned long> & v);
95 bool getState (const std::vector<unsigned lo 95 bool getState (const std::vector<unsigned long> & v);
96 96
97 static const unsigned int VECTOR_STATE_SIZE 97 static const unsigned int VECTOR_STATE_SIZE = 30;
98 98
99 private: 99 private:
100 100
101 void update(); 101 void update();
102 void advance(int dozens); 102 void advance(int dozens);
103 103
104 int pDiscard; // separate sequence by p- 104 int pDiscard; // separate sequence by p-r = p-12 discarded elements
105 int pDozens; // pDiscard / 12; 105 int pDozens; // pDiscard / 12;
106 int endIters; // pDiscard % 12; 106 int endIters; // pDiscard % 12;
107 int luxury; 107 int luxury;
108 108
109 int index; 109 int index;
110 double randoms[12]; // randoms [i] is the x[ 110 double randoms[12]; // randoms [i] is the x[n-i] of Luscher's note
111 double carry; 111 double carry;
112 112
113 }; // Ranlux64Engine 113 }; // Ranlux64Engine
114 114
115 } // namespace CLHEP 115 } // namespace CLHEP
116 116
117 #endif // Ranlux64Engine_h 117 #endif // Ranlux64Engine_h
118 118