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TRandom.h
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1 // @(#)root/mathcore:$Id$
2 // Author: Rene Brun 15/12/95
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #ifndef ROOT_TRandom
13 #define ROOT_TRandom
14 
15 #include "Math/TRandomEngine.h"
16 
17 //////////////////////////////////////////////////////////////////////////
18 // //
19 // TRandom //
20 // //
21 // Simple prototype random number generator class (periodicity = 10**9) //
22 // //
23 //////////////////////////////////////////////////////////////////////////
24 
25 #include "TNamed.h"
26 
27 class TRandom : public TNamed, public ROOT::Math::TRandomEngine {
28 
29 protected:
30  UInt_t fSeed; //Random number generator seed
31 
32 public:
33  TRandom(UInt_t seed=65539);
34  virtual ~TRandom();
35  virtual Int_t Binomial(Int_t ntot, Double_t prob);
36  virtual Double_t BreitWigner(Double_t mean=0, Double_t gamma=1);
37  virtual void Circle(Double_t &x, Double_t &y, Double_t r);
38  virtual Double_t Exp(Double_t tau);
39  virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1);
40  virtual UInt_t GetSeed() const {return fSeed;}
41  virtual UInt_t Integer(UInt_t imax);
42  virtual Double_t Landau(Double_t mean=0, Double_t sigma=1);
43  virtual Int_t Poisson(Double_t mean);
44  virtual Double_t PoissonD(Double_t mean);
45  virtual void Rannor(Float_t &a, Float_t &b);
46  virtual void Rannor(Double_t &a, Double_t &b);
47  virtual void ReadRandom(const char *filename);
48  virtual void SetSeed(ULong_t seed=0);
49  virtual Double_t Rndm();
50  // keep for backward compatibility
51  virtual Double_t Rndm(Int_t ) { return Rndm(); }
52  virtual void RndmArray(Int_t n, Float_t *array);
53  virtual void RndmArray(Int_t n, Double_t *array);
54  virtual void Sphere(Double_t &x, Double_t &y, Double_t &z, Double_t r);
55  virtual Double_t Uniform(Double_t x1=1);
56  virtual Double_t Uniform(Double_t x1, Double_t x2);
57  virtual void WriteRandom(const char *filename) const;
58 
59  ClassDef(TRandom,3) //Simple Random number generator (periodicity = 10**9)
60 };
61 
62 R__EXTERN TRandom *gRandom;
63 
64 #endif