1 // ----------------------------------------------------------------------
4 // This class provides some tools which can be useful in the analsis
5 // of spectra, to fit or transform histograms. See the comments of the
6 // individual methods for details
8 // Author: M. Floris (CERN)
9 // ----------------------------------------------------------------------
14 #if !defined(__CINT__) || defined(__MAKECINT__)
28 class AliPWGHistoTools : public TObject {
35 static TH1 * GetOneOverPtdNdPt(const TH1 * hPt) ;
36 static TH1 * GetdNdmtFromdNdpt(const TH1 * hpt, Double_t mass);
37 static TH1 * GetdNdPtFromOneOverPt(const TH1 * h1Pt) ;
38 static TH1 * GetdNdptFromdNdmt(const TH1 * hmt, Double_t mass) ;
40 static TGraphErrors * ConcatenateGraphs(const TGraphErrors * g1,const TGraphErrors * g2);
41 static TH1F * GetHistoFromGraph(const TGraphErrors * g, const TH1F* hTemplate) ;
42 static TGraphErrors * GetGraphFromHisto(const TH1F * h, Bool_t binWidth = kTRUE) ;
43 static void GetMeanDataAndExtrapolation(const TH1 * hData, TF1 * fExtrapolation, Double_t &mean, Double_t &error, Float_t min=0, Float_t max=100);
45 static TH1F * CombineHistos(const TH1 * h1, TH1 * h2, const TH1* htemplate, Float_t renorm1=1.);
46 static TH1F * Combine3HistosWithErrors(const TH1 * h1, const TH1 * h2, const TH1* h3,
47 TH1 * he1, TH1 * he2, TH1 * he3,
48 const TH1* htemplate, Int_t statFrom = 0,
49 Float_t renorm1=1., Float_t renorm2=1., Float_t renorm3=1.,
50 TH1 ** hSyst =0, Bool_t errorFromBinContent=kFALSE);
51 static void GetFromHistoGraphDifferentX(const TH1F * h, TF1 * f, TGraphErrors ** gBarycentre, TGraphErrors ** gXlw);
52 static Float_t GetMean(TH1F * h, Float_t min, Float_t max, Float_t * error = NULL) ;
54 static void GetMean(TF1 * func, Float_t &mean, Float_t &error, Float_t min=0, Float_t max=100, Int_t normPar = -1);
55 static void GetMeanSquare(TF1 * func, Float_t &mean, Float_t &error, Float_t min=0, Float_t max=100, Int_t normPar = -1) ;
57 static Bool_t Fit (TH1 * h, TF1* f, Float_t min, Float_t max) ;
59 static Int_t GetLowestNotEmptyBin(const TH1*h);
60 static Int_t GetHighestNotEmptyBin(const TH1*h);
61 static Float_t GetLowestNotEmptyBinEdge(const TH1*h) { return h->GetBinLowEdge(GetLowestNotEmptyBin(h));}
62 static Float_t GetHighestNotEmptyBinEdge(const TH1*h) { return h->GetBinLowEdge(GetHighestNotEmptyBin(h)+1);}
64 static void GetResiduals(const TGraphErrors * gdata, const TF1 * func, TH1F ** hres, TGraphErrors ** gres) ;
65 static void GetResiduals(const TH1F* hdata, const TF1 * func, TH1F ** hres, TH1F ** hresVsBin) ;
67 static void GetYield(TH1* h, TF1 * f, Double_t &yield, Double_t &yieldError, Float_t min = 0,
68 Float_t max = 100, Double_t *partialYields=0, Double_t *partialYieldsErrors=0);
70 static TGraphErrors * DivideGraphByFunc (const TGraphErrors * g, const TF1 * f, Bool_t invert = kFALSE);
71 static TGraphErrors * DivideGraphByHisto(const TGraphErrors * g, TH1 * h, Bool_t invert = kFALSE);
72 static TH1F * DivideHistoByFunc (TH1F * h, TF1 * f, Bool_t invert = kFALSE);
74 static void WeightedMean(Int_t npoints, const Double_t *x, const Double_t *xerr, Double_t &mean, Double_t &meanerr);
76 static void GetValueAndError(TH1 * hdest, const TH1 * hvalue, const TH1 * herror, Bool_t isPercentError) ;
77 static TH1 * GetRelativeError(TH1 * h);
78 static void AddHisto(TH1 * hdest, const TH1* hsource, Bool_t getMirrorBins = kFALSE);
79 static void GetHistoCombinedErrors(TH1 * hdest, const TH1 * h1) ;
80 static TH1F * DivideHistosDifferentBins(const TH1F* h1, const TH1F* h2);
81 static Double_t DoIntegral(TH1* h, Int_t binx1, Int_t binx2, Int_t biny1, Int_t biny2, Int_t binz1, Int_t binz2, Double_t & error ,
82 Option_t *option, Bool_t doError) ;
83 static TGraphErrors * Divide2Graphs(const TGraph * g1, const TGraph * g2, Int_t strategy);
84 static TGraphErrors * Add2Graphs(const TGraphErrors * g1, const TGraphErrors * g2);
85 static void ScaleGraph (TGraph * g1, Double_t scale);
88 static Double_t dMtdptFunction(Double_t *x, Double_t *p) ;
89 static Double_t GetdMtdEta(TH1 *hData, TF1 * fExtrapolation, Double_t mass) ;
91 // static Bool_t Compare2Plots(TObject * obj1, TObject * obj2);
96 AliPWGHistoTools(const AliPWGHistoTools&); // not implemented
97 AliPWGHistoTools& operator=(const AliPWGHistoTools&); // not implemented
98 static void GetMoment(TString name, TString var, TF1 * func, Float_t &mean, Float_t &error, Float_t min, Float_t max, Int_t normPar = -1) ;
100 static TF1 * fdNdptForETCalc;
102 ClassDef(AliPWGHistoTools,1);