Smoothing.C

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/// \file
/// \ingroup tutorial_spectrum
/// \notebook
/// Example to illustrate smoothing using Markov algorithm (class TSpectrum).
///
/// \macro_image
/// \macro_code
///
/// \author Miroslav Morhac
 
void Smoothing() {
   Int_t i;
   const Int_t nbins = 1024;
   Double_t xmin  = 0;
   Double_t xmax  = nbins;
   Double_t source[nbins];
   gROOT->ForceStyle();
 
   TString dir  = gROOT->GetTutorialDir();
   TString file = dir+"/spectrum/TSpectrum.root";
   TFile *f     = new TFile(file.Data());
   TH1F *h = (TH1F*) f->Get("back1");
   h->SetTitle("Smoothed spectrum for m=3");
 
   for (i = 0; i < nbins; i++) source[i]=h->GetBinContent(i + 1);
   h->SetAxisRange(1,1024);
   h->Draw("L");
 
   TSpectrum *s = new TSpectrum();
 
   TH1F *smooth = new TH1F("smooth","smooth",nbins,0.,nbins);
   smooth->SetLineColor(kRed);
 
   s->SmoothMarkov(source,1024,3);  //3, 7, 10
   for (i = 0; i < nbins; i++) smooth->SetBinContent(i + 1,source[i]);
   smooth->Draw("L SAME");
}