Src2.C File Reference

Detailed Description

Example to illustrate high resolution peak searching function (class TSpectrum2).

 
Found 5 candidate peaks
posx= 216, posy= 69, value=1502
posx= 191, posy= 188, value=1404
posx= 66, posy= 51, value=1555
posx= 109, posy= 100, value=1260
posx= 40, posy= 222, value=978

 
#include <TSpectrum2.h>
 
void Src2()
{
   const Int_t nbinsx = 256;
   const Int_t nbinsy = 256;
   std::vector<Double_t *> source(nbinsx), dest(nbinsx);
   for (Int_t i = 0; i < nbinsx; i++) {
      source[i] = new Double_t[nbinsy];
      dest[i] = new Double_t[nbinsy];
   }
   TString dir = gROOT->GetTutorialDir();
   TString file = dir + "/legacy/spectrum/TSpectrum2.root";
   TFile *f = TFile::Open(file.Data());
   gStyle->SetOptStat(0);
   auto search = (TH2F *)f->Get("back3");
   TSpectrum2 s;
   for (Int_t i = 0; i < nbinsx; i++) {
      for (Int_t j = 0; j < nbinsy; j++) {
         source[i][j] = search->GetBinContent(i + 1, j + 1);
      }
   }
   Int_t nfound = s.SearchHighRes(source.data(), dest.data(), nbinsx, nbinsy, 2, 10, kTRUE, 10, kFALSE, 3);
   printf("Found %d candidate peaks\n", nfound);
   Double_t *PositionX = s.GetPositionX();
   Double_t *PositionY = s.GetPositionY();
   search->Draw("COL");
   TMarker m;
   m.SetMarkerStyle(23);
   m.SetMarkerColor(kRed);
   for (Int_t i = 0; i < nfound; i++) {
      printf("posx= %d, posy= %d, value=%d\n", (Int_t)(PositionX[i] + 0.5), (Int_t)(PositionY[i] + 0.5),
             (Int_t)source[(Int_t)(PositionX[i] + 0.5)][(Int_t)(PositionY[i] + 0.5)]);
      m.DrawMarker(PositionX[i], PositionY[i]);
   }
   for (Int_t i = 0; i < nbinsx; i++) {
      delete[] source[i];
      delete[] dest[i];
   }
}

Authors

Miroslav Morhac, Olivier Couet

Definition in file Src2.C.