Src3.C File Reference

Detailed Description

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

 
Found 13 candidate peaks
posx= 46, posy= 44, value=1962
posx= 39, posy= 4, value=1829
posx= 46, posy= 19, value=1762
posx= 50, posy= 32, value=1745
posx= 23, posy= 56, value=1710
posx= 35, posy= 48, value=1546
posx= 19, posy= 3, value=1524
posx= 39, posy= 58, value=1499
posx= 15, posy= 22, value=1376
posx= 38, posy= 16, value=1170
posx= 4, posy= 21, value=1166
posx= 10, posy= 16, value=1013
posx= 8, posy= 35, value=708

 
#include <TSpectrum2.h>
 
void Src3() {
   Int_t i, j, nfound;
   const Int_t nbinsx = 64;
   const Int_t nbinsy = 64;
   Double_t xmin = 0;
   Double_t xmax = (Double_t)nbinsx;
   Double_t ymin = 0;
   Double_t ymax = (Double_t)nbinsy;
   Double_t** source = new Double_t*[nbinsx];
   for (i=0;i<nbinsx;i++)
      source[i]=new Double_t[nbinsy];
   Double_t** dest = new Double_t*[nbinsx];
   for (i=0;i<nbinsx;i++)
      dest[i]=new Double_t[nbinsy];
   TString dir  = gROOT->GetTutorialDir();
   TString file = dir+"/spectrum/TSpectrum2.root";
   TFile *f     = new TFile(file.Data());
   gStyle->SetOptStat(0);
   auto search = (TH2F*) f->Get("search1");
   auto s = new TSpectrum2();
   for (i = 0; i < nbinsx; i++){
      for (j = 0; j < nbinsy; j++){
         source[i][j] = search->GetBinContent(i + 1,j + 1);
      }
   }
   nfound = s->SearchHighRes(source, dest, nbinsx, nbinsy, 2, 2, kFALSE, 3, kFALSE, 1);//3, 10, 100
   printf("Found %d candidate peaks\n",nfound);
   Double_t *PositionX = s->GetPositionX();
   Double_t *PositionY = s->GetPositionY();
   search->Draw("CONT");
   auto m = new TMarker();
   m->SetMarkerStyle(23);
   m->SetMarkerColor(kRed);
   for (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]);
   }
}

Authors

Miroslav Morhac, Olivier Couet

Definition in file Src3.C.