Bug fix

[u/mrichter/AliRoot.git] / PWG3 / vertexingHF / AliHFMassFitter.h

#ifndef ALIHFMASSFITTER_H
#define ALIHFMASSFITTER_H
/* Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/////////////////////////////////////////////////////////////
//
// AliHFMassFitter for the fit of invariant mass distribution
// of charmed mesons
//
// Author: C.Bianchin, chiara.bianchin@pd.infn.it
/////////////////////////////////////////////////////////////

#include <TNamed.h>
#include <TString.h>

class TF1;
class TNtuple;
class TFile;
class TList;
class TH1F;

class AliHFMassFitter : public TNamed {

 public:
  AliHFMassFitter();
  AliHFMassFitter(const TH1F* histoToFit, Double_t minvalue, Double_t maxvalue, Int_t rebin=1,Int_t fittypeb=0,Int_t fittypes=0);
  virtual ~AliHFMassFitter();

  AliHFMassFitter(const AliHFMassFitter &mfit);
  AliHFMassFitter& operator=(const AliHFMassFitter &mfit);

  //setters
  void     SetHisto(const TH1F *histoToFit);
  void     SetRangeFit(Double_t minvalue, Double_t maxvalue){fminMass=minvalue; fmaxMass=maxvalue;}
  void     SetMinRangeFit(Double_t minvalue){fminMass=minvalue;}
  void     SetMaxRangeFit(Double_t maxvalue){fmaxMass=maxvalue;}
  void     SetBinN(Int_t newbinN){fNbin=newbinN;}
  void     SetType(Int_t fittypeb, Int_t fittypes);
  void     SetReflectionSigmaFactor(Int_t constant) {ffactor=constant;}
  void     SetInitialGaussianMean(Double_t mean) {fMass=mean;} // change the default value of the mean
  void     SetInitialGaussianSigma(Double_t sigma) {fSigmaSgn=sigma;} // change the default value of the sigma
  void     SetSideBands(Bool_t onlysidebands=kTRUE) {fSideBands=onlysidebands;} // consider only side bands

  //getters
  TH1F*    GetHistoClone() const; //return the histogram
  void     GetRangeFit(Double_t &minvalue, Double_t &maxvalue) const {minvalue=fminMass; maxvalue=fmaxMass;}
  Double_t GetMinRangeFit()const {return fminMass;}
  Double_t GetMaxRangeFit()const {return fmaxMass;}
  Int_t    GetBinN()       const {return fNbin;}
  void     GetFitPars(Float_t* pars) const;
  void     GetTypeOfFit(Bool_t &background, Int_t &typeb) const {background = fWithBkg; typeb = ftypeOfFit4Bkg;}
  Int_t    GetReflectionSigmaFactor() const {return ffactor;} 
  Double_t GetMean() const {return fMass;}
  Double_t GetSigma()const {return fSigmaSgn;}
  Double_t GetChiSquare() const;
  Double_t GetReducedChiSquare() const;
  void     GetSideBandsBounds(Int_t& lb, Int_t& hb) const;

  void     PrintParTitles() const;

  void     InitNtuParam(char *ntuname="ntupar"); // initialize TNtuple to store the parameters
  void     FillNtuParam(); //Fill the TNtuple with the current parameters
  TNtuple* GetNtuParam() const {return fntuParam;} // return the TNtuple
  TNtuple* NtuParamOneShot(char *ntuname="ntupar"); // the three functions above all together
  void     WriteHisto(TString path="./") const; // write the histogram
  void     WriteNtuple(TString path="./") const; // write the TNtuple
  void     DrawFit() const;
  void     Reset();

  void     IntS(Float_t *valuewitherror) const;    // integral of signal given my the fit with error
  Double_t IntTot() const {return fhistoInvMass->Integral("width");}  // return total integral of the histogram
  void     Signal(Double_t nOfSigma,Double_t &signal,Double_t &errsignal) const; // signal in nsigma with error 
  void     Signal(Double_t min,Double_t max,Double_t &signal,Double_t &errsignal) const; // signal in (min, max) with error 
  void     Background(Double_t nOfSigma,Double_t &background,Double_t &errbackground) const; // backgournd in nsigma with error 
  void     Background(Double_t min,Double_t max,Double_t &background,Double_t &errbackground) const; // backgournd in (min, max) with error 
  void     Significance(Double_t nOfSigma,Double_t &significance,Double_t &errsignificance) const; // significance in nsigma with error 
  void     Significance(Double_t min,Double_t max,Double_t &significance,Double_t &errsignificance) const; // significance in (min, max) with error 

  Double_t FitFunction4MassDistr (Double_t* x, Double_t* par);
  Double_t FitFunction4Sgn (Double_t* x, Double_t* par);
  Double_t FitFunction4Bkg (Double_t* x, Double_t* par);
  Bool_t   MassFitter(Bool_t draw=kTRUE);
  void     RebinMass(Int_t binground=1);
  

 private:

  void     ComputeParSize();
  Bool_t   SideBandsBounds();
  void     AddFunctionsToHisto();

  TH1F    *fhistoInvMass;  // histogram to fit
  Double_t fminMass;       // lower mass limit
  Double_t fmaxMass;       // upper mass limit
  Int_t    fNbin;          // number of bins
  Int_t    fParsSize;      // size of fFitPars array
  Float_t *fFitPars;       //[fParsSize] array of fit parameters
  Bool_t   fWithBkg;       // signal+background (kTRUE) or signal only (kFALSE)
  Int_t    ftypeOfFit4Bkg; // 0 = exponential; 1 = linear; 2 = pol2
  Int_t    ftypeOfFit4Sgn; // 0 = gaus; 1 = gaus+gaus broadened
  Int_t    ffactor;         // number to multiply to the sigma of the signal to obtain the reflected gaussian
  TNtuple *fntuParam;      // contains fit parameters
  Double_t fMass;          // signal gaussian mean value
  Double_t fSigmaSgn;      // signal gaussian sigma
  Bool_t   fSideBands;     // kTRUE = only side bands considered
  Int_t    fSideBandl;     // left side band limit (bin number)
  Int_t    fSideBandr;     // right side band limit (bin number)
  Int_t    fcounter;       // internal counter
  TList   *fContourGraph;  // TList of TGraph containing contour plots
  ClassDef(AliHFMassFitter,3); // class for invariant mass fit
};

#endif