| Geant4 Cross Reference |
>> 1 // $Id:$
1 // -*- C++ -*- 2 // -*- C++ -*-
2 // 3 //
3 // ------------------------------------------- 4 // -----------------------------------------------------------------------
4 // HEP Random 5 // HEP Random
5 // --- RandGamma --- 6 // --- RandGamma ---
6 // class header file 7 // class header file
7 // ------------------------------------------- 8 // -----------------------------------------------------------------------
8 9
9 // Class defining methods for shooting gamma d 10 // Class defining methods for shooting gamma distributed random values,
10 // given a k (default=1) and specifying also a 11 // given a k (default=1) and specifying also a lambda (default=1).
11 // Default values are used for operator()(). 12 // Default values are used for operator()().
12 13
13 // Valid input values are k > 0 and lambda > 0 14 // Valid input values are k > 0 and lambda > 0. When invalid values are
14 // presented, the code silently returns -1.0. 15 // presented, the code silently returns -1.0.
15 16
16 // =========================================== 17 // =======================================================================
17 // John Marraffino - Created: 12th May 1998 B 18 // John Marraffino - Created: 12th May 1998 Based on the C-Rand package
18 // by Ernst Stadlober and Fr 19 // by Ernst Stadlober and Franz Niederl of the Technical
19 // University of Graz, Austr 20 // University of Graz, Austria.
20 // Gabriele Cosmo - Removed useless methods a 21 // Gabriele Cosmo - Removed useless methods and data: 5th Jan 1999
21 // M Fischler - put and get to/from strea 22 // M Fischler - put and get to/from streams 12/10/04
22 // =========================================== 23 // =======================================================================
23 24
24 #ifndef RandGamma_h 25 #ifndef RandGamma_h
25 #define RandGamma_h 1 26 #define RandGamma_h 1
26 27
27 #include "CLHEP/Random/Random.h" 28 #include "CLHEP/Random/Random.h"
28 #include "CLHEP/Utility/memory.h" 29 #include "CLHEP/Utility/memory.h"
29 30
30 namespace CLHEP { 31 namespace CLHEP {
31 32
32 /** 33 /**
33 * @author 34 * @author
34 * @ingroup random 35 * @ingroup random
35 */ 36 */
36 class RandGamma : public HepRandom { 37 class RandGamma : public HepRandom {
37 38
38 public: 39 public:
39 40
40 inline RandGamma ( HepRandomEngine& anEngine 41 inline RandGamma ( HepRandomEngine& anEngine, double k=1.0,
41 42 double lambda=1.0 );
42 inline RandGamma ( HepRandomEngine* anEngine 43 inline RandGamma ( HepRandomEngine* anEngine, double k=1.0,
43 44 double lambda=1.0 );
44 // These constructors should be used to inst 45 // These constructors should be used to instantiate a RandGamma
45 // distribution object defining a local engi 46 // distribution object defining a local engine for it.
46 // The static generator will be skipped usin 47 // The static generator will be skipped using the non-static methods
47 // defined below. 48 // defined below.
48 // If the engine is passed by pointer the co 49 // If the engine is passed by pointer the corresponding engine object
49 // will be deleted by the RandGamma destruct 50 // will be deleted by the RandGamma destructor.
50 // If the engine is passed by reference the 51 // If the engine is passed by reference the corresponding engine object
51 // will not be deleted by the RandGamma dest 52 // will not be deleted by the RandGamma destructor.
52 53
53 virtual ~RandGamma(); 54 virtual ~RandGamma();
54 // Destructor 55 // Destructor
55 56
56 // Static methods to shoot random values usi 57 // Static methods to shoot random values using the static generator
57 58
58 static inline double shoot(); 59 static inline double shoot();
59 60
60 static double shoot( double k, double lambda 61 static double shoot( double k, double lambda );
61 62
62 static void shootArray ( const int size, dou 63 static void shootArray ( const int size, double* vect,
63 double k=1.0, doub 64 double k=1.0, double lambda=1.0 );
64 65
65 // Static methods to shoot random values us 66 // Static methods to shoot random values using a given engine
66 // by-passing the static generator. 67 // by-passing the static generator.
67 68
68 static inline double shoot( HepRandomEngine* 69 static inline double shoot( HepRandomEngine* anEngine );
69 70
70 static double shoot( HepRandomEngine* anEngi 71 static double shoot( HepRandomEngine* anEngine,
71 double k, do 72 double k, double lambda );
72 73
73 static void shootArray ( HepRandomEngine* an 74 static void shootArray ( HepRandomEngine* anEngine, const int size,
74 double* vect, doub 75 double* vect, double k=1.0,
75 double lambda=1.0 76 double lambda=1.0 );
76 77
77 // Methods using the localEngine to shoot r 78 // Methods using the localEngine to shoot random values, by-passing
78 // the static generator. 79 // the static generator.
79 80
80 inline double fire(); 81 inline double fire();
81 82
82 double fire( double k, double lambda ); 83 double fire( double k, double lambda );
83 84
84 void fireArray ( const int size, double* vec 85 void fireArray ( const int size, double* vect);
85 void fireArray ( const int size, double* vec 86 void fireArray ( const int size, double* vect,
86 double k, double lambda ); 87 double k, double lambda );
87 inline double operator()(); 88 inline double operator()();
88 inline double operator()( double k, double l 89 inline double operator()( double k, double lambda );
89 90
90 // Save and restore to/from streams 91 // Save and restore to/from streams
91 92
92 std::ostream & put ( std::ostream & os ) con 93 std::ostream & put ( std::ostream & os ) const;
93 std::istream & get ( std::istream & is ); 94 std::istream & get ( std::istream & is );
94 95
95 std::string name() const; 96 std::string name() const;
96 HepRandomEngine & engine(); 97 HepRandomEngine & engine();
97 98
98 static std::string distributionName() {retur 99 static std::string distributionName() {return "RandGamma";}
99 // Provides the name of this distribution cl 100 // Provides the name of this distribution class
100 101
101 102
102 private: 103 private:
103 104
104 static double genGamma( HepRandomEngine *anE 105 static double genGamma( HepRandomEngine *anEngine, double k,
105 106 double lambda );
106 107
107 std::shared_ptr<HepRandomEngine> localEngine 108 std::shared_ptr<HepRandomEngine> localEngine;
108 double defaultK; 109 double defaultK;
109 double defaultLambda; 110 double defaultLambda;
110 111
111 }; 112 };
112 113
113 } // namespace CLHEP 114 } // namespace CLHEP
114 115
115 #include "CLHEP/Random/RandGamma.icc" 116 #include "CLHEP/Random/RandGamma.icc"
116 117
117 #endif 118 #endif
118 119