SearchHR3.C File Reference

Detailed Description

Example to illustrate the influence of number of iterations in deconvolution in high resolution peak searching function (class TSpectrum).

Processing /builddir/build/BUILD/root-6.10.02/tutorials/spectrum/SearchHR3.C...
Found 11 candidate peaks

void SearchHR3() {
   Double_t fPositionX[100];
   Double_t fPositionY[100];
   Int_t fNPeaks = 0;
   Int_t i,nfound,bin;
   const Int_t nbins = 1024;
   Double_t xmin     = 0;
   Double_t xmax     = nbins;
   Double_t a;
   Double_t source[nbins], dest[nbins];
   gROOT->ForceStyle();

   TString dir  = gROOT->GetTutorialDir();
   TString file = dir+"/spectrum/TSpectrum.root";
   TFile *f     = new TFile(file.Data());
   TH1F *h = (TH1F*) f->Get("back2");
   h->SetTitle("Influence of # of iterations in deconvolution in peak searching");
   h->GetXaxis()->SetRange(1,nbins);

   TH1F *d1 = new TH1F("d1","",nbins,xmin,xmax);
   TH1F *d2 = new TH1F("d2","",nbins,xmin,xmax);
   TH1F *d3 = new TH1F("d3","",nbins,xmin,xmax);
   TH1F *d4 = new TH1F("d4","",nbins,xmin,xmax);

   TSpectrum *s = new TSpectrum();

   for (i = 0; i < nbins; i++) source[i]=h->GetBinContent(i + 1);
   nfound = s->SearchHighRes(source, dest, nbins, 8, 2, kTRUE, 3, kTRUE, 3);

   Double_t *xpeaks = s->GetPositionX();
   for (i = 0; i < nfound; i++) {
      a=xpeaks[i];
      bin = 1 + Int_t(a + 0.5);
      fPositionX[i] = h->GetBinCenter(bin);
      fPositionY[i] = h->GetBinContent(bin);
   }
   TPolyMarker * pm = (TPolyMarker*)h->GetListOfFunctions()->FindObject("TPolyMarker");
   if (pm) {
      h->GetListOfFunctions()->Remove(pm);
      delete pm;
   }
   pm = new TPolyMarker(nfound, fPositionX, fPositionY);
   h->GetListOfFunctions()->Add(pm);
   pm->SetMarkerStyle(23);
   pm->SetMarkerColor(kRed);
   pm->SetMarkerSize(1.3);

   h->Draw("L");

   for (i = 0; i < nbins; i++) d1->SetBinContent(i + 1,dest[i]);
   d1->SetLineColor(kRed);
   d1->Draw("SAME");

   for (i = 0; i < nbins; i++) source[i]=h->GetBinContent(i + 1);
   s->SearchHighRes(source, dest, nbins, 8, 2, kTRUE, 10, kTRUE, 3);
   for (i = 0; i < nbins; i++) d2->SetBinContent(i + 1,dest[i]);
   d2->SetLineColor(kBlue);
   d2->Draw("SAME");

   for (i = 0; i < nbins; i++) source[i]=h->GetBinContent(i + 1);
   s->SearchHighRes(source, dest, nbins, 8, 2, kTRUE, 100, kTRUE, 3);
   for (i = 0; i < nbins; i++) d3->SetBinContent(i + 1,dest[i]);
   d3->SetLineColor(kGreen);
   d3->Draw("SAME");

   for (i = 0; i < nbins; i++) source[i]=h->GetBinContent(i + 1);
   s->SearchHighRes(source, dest, nbins, 8, 2, kTRUE, 1000, kTRUE, 3);
   for (i = 0; i < nbins; i++) d4->SetBinContent(i + 1,dest[i]);
   d4->SetLineColor(kMagenta);
   d4->Draw("SAME");

   printf("Found %d candidate peaks\n",nfound);
}

Authors

Miroslav Morhac, Olivier Couet

Definition in file SearchHR3.C.