#ifndef ALIMATH_H
#define ALIMATH_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

#include <iostream.h>
#include <math.h>
 
#include "TObject.h"
 
class AliMath : public TObject
{
 public:
  AliMath();                            // Default constructor
  ~AliMath();                           // Destructor
  Float_t Gamma(Float_t z);             // Standard gamma function Gamma(z)
  Float_t Gamma(Float_t a,Float_t x);   // Incomplete gamma function P(a,x)
  Float_t LnGamma(Float_t z);           // Compute ln[Gamma(z)]
  Float_t Erf(Float_t x);               // Error function erf(x)
  Float_t Erfc(Float_t x);              // Complementary error function erfc(x)
  Float_t Prob(Float_t chi2,Int_t ndf); // Compute Chi-squared probability
 
 protected:
  Float_t GamSer(Float_t a,Float_t x);  // Compute P(a,x) via serial representation
  Float_t GamCf(Float_t a,Float_t x);   // Compute P(a,x) via continued fractions
 
 ClassDef(AliMath,1) // Various mathematical tools for physics analysis.
 
};
#endif