Access to the number of associated clusters (M.Ivanov)
[u/mrichter/AliRoot.git] / RALICE / AliRandom.h
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d88f97cc 1#ifndef ALIRANDOM_H
2#define ALIRANDOM_H
3da30618 3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
f531a546 6// $Id$
3da30618 7
d88f97cc 8#include <math.h>
9
10#include "TObject.h"
11
12class AliRandom : public TObject
13{
14 public:
15 AliRandom(); // Constructor with default sequence
16 AliRandom(Int_t seed); // Constructor with user defined seed
17 AliRandom(Int_t seed,Int_t cnt1,Int_t cnt2); // User defined starting point
1c01b4f8 18 virtual ~AliRandom(); // Destructor
d88f97cc 19 Int_t GetSeed(); // Provide current seed value
20 Int_t GetCnt1(); // Provide current counter value cnt1
21 Int_t GetCnt2(); // Provide current counter value cnt2
84bb7c66 22 void Data(); // Print current seed, cnt1 and cnt2
d88f97cc 23 Float_t Uniform(); // Uniform dist. within <0,1>
24 Float_t Uniform(Float_t a,Float_t b); // Uniform dist. within <a,b>
25 void Uniform(Float_t* vec,Int_t n); // n uniform randoms in <0,1>
26 void Uniform(Float_t* vec,Int_t n,Float_t a,Float_t b); // see above
27 Float_t Gauss(); // Gaussian dist. with mean=0 sigma=1
28 Float_t Gauss(Float_t mean,Float_t sigma); // Gaussian dist. with mean and sigma
29 void Gauss(Float_t* vec,Int_t n); // n Gaussian randoms mean=0 sigma=1
30 void Gauss(Float_t* vec,Int_t n,Float_t mean,Float_t sigma); // see above
31 Float_t Poisson(Float_t mean); // Poisson dist. with certain mean
32 void Poisson(Float_t* vec,Int_t n,Float_t mean); // n Poisson randoms with mean
33 void SetUser(Float_t a,Float_t b,Int_t n,Float_t (*f)(Float_t)); // User dist. f(x)
34 void SetUser(Float_t* x,Float_t* y,Int_t n); // User dist. arrays
35 Float_t User(); // Provide random in [a,b] according to user distribution
36 void User(Float_t* vec,Int_t n); // n randoms in [a,b] from user dist.
37
38 private:
39 Int_t fI,fJ,fSeed,fCnt1,fCnt2,fClip; // Indices, seed and counters
40 Float_t fU[97],fC,fCd,fCm; // The Fibonacci parameters
41 void Start(Int_t seed,Int_t cnt1,Int_t cnt2); // Start at certain point
42 void Unpack(Int_t seed,Int_t& i,Int_t& j,Int_t& k,Int_t& l); // Unpack the seed
43 void Uniform(Int_t n); // n uniform randoms for quick skipping
44 Int_t fNa; //! The number of bins of the area function
45 Float_t* fXa; //! The binned x values of the area function
46 Float_t* fYa; //! The corresponding y values of the area function
47 Float_t fYamin,fYamax; //! The min. and max. y values of the area function
48 Int_t* fIbins; //! The bin numbers of the random x candidates
49
84bb7c66 50 ClassDef(AliRandom,2) // Generate universal random numbers on all common machines.
d88f97cc 51};
52#endif