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d88f97cc | 1 | #ifndef ALIMATH_H |
2 | #define ALIMATH_H | |
3da30618 | 3 | /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
4 | * See cxx source for full Copyright notice */ | |
5 | ||
6 | /* $Id$ */ | |
7 | ||
d88f97cc | 8 | #include <iostream.h> |
9 | #include <math.h> | |
10 | ||
11 | #include "TObject.h" | |
12 | ||
13 | class AliMath : public TObject | |
14 | { | |
15 | public: | |
16 | AliMath(); // Default constructor | |
17 | ~AliMath(); // Destructor | |
18 | Float_t Gamma(Float_t z); // Standard gamma function Gamma(z) | |
19 | Float_t Gamma(Float_t a,Float_t x); // Incomplete gamma function P(a,x) | |
20 | Float_t LnGamma(Float_t z); // Compute ln[Gamma(z)] | |
21 | Float_t Erf(Float_t x); // Error function erf(x) | |
22 | Float_t Erfc(Float_t x); // Complementary error function erfc(x) | |
23 | Float_t Prob(Float_t chi2,Int_t ndf); // Compute Chi-squared probability | |
24 | ||
25 | protected: | |
26 | Float_t GamSer(Float_t a,Float_t x); // Compute P(a,x) via serial representation | |
27 | Float_t GamCf(Float_t a,Float_t x); // Compute P(a,x) via continued fractions | |
28 | ||
959fbac5 | 29 | ClassDef(AliMath,1) // Various mathematical tools for physics analysis. |
d88f97cc | 30 | |
31 | }; | |
32 | #endif |