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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 | ||
f531a546 | 6 | // $Id$ |
3da30618 | 7 | |
d88f97cc | 8 | #include <iostream.h> |
9 | #include <math.h> | |
10 | ||
11 | #include "TObject.h" | |
12 | ||
13 | class AliMath : public TObject | |
14 | { | |
15 | public: | |
29beb80d | 16 | AliMath(); // Default constructor |
17 | ~AliMath(); // Destructor | |
18 | Double_t Gamma(Double_t z); // Standard gamma function Gamma(z) | |
19 | Double_t Gamma(Double_t a,Double_t x); // Incomplete gamma function P(a,x) | |
20 | Double_t LnGamma(Double_t z); // Compute ln[Gamma(z)] | |
21 | Double_t Erf(Double_t x); // Error function erf(x) | |
22 | Double_t Erfc(Double_t x); // Complementary error function erfc(x) | |
23 | Double_t Prob(Double_t chi2,Int_t ndf); // Compute Chi-squared probability | |
24 | Double_t BesselI(Int_t n,Double_t x); // Compute integer order modified Bessel function I_n(x) | |
25 | Double_t BesselK(Int_t n,Double_t x); // Compute integer order modified Bessel function K_n(x) | |
d88f97cc | 26 | |
27 | protected: | |
29beb80d | 28 | Double_t GamSer(Double_t a,Double_t x); // Compute P(a,x) via serial representation |
29 | Double_t GamCf(Double_t a,Double_t x); // Compute P(a,x) via continued fractions | |
30 | Double_t BesselI0(Double_t x); // Compute modified Bessel function I_0(x) | |
31 | Double_t BesselK0(Double_t x); // Compute modified Bessel function K_0(x) | |
32 | Double_t BesselI1(Double_t x); // Compute modified Bessel function I_1(x) | |
33 | Double_t BesselK1(Double_t x); // Compute modified Bessel function K_1(x) | |
d88f97cc | 34 | |
959fbac5 | 35 | ClassDef(AliMath,1) // Various mathematical tools for physics analysis. |
d88f97cc | 36 | |
37 | }; | |
38 | #endif |