Example to illustrate the background estimator (class TSpectrum2).
Author: Miroslav Morhac, Olivier Couet
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, March 19, 2024 at 07:19 PM.
Int_t i, j;
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];
TString dir = gROOT->GetTutorialDir();
TString file = dir+"/spectrum/TSpectrum2.root";
TFile *f = new TFile(file.Data());
auto back = (TH2F*) f->Get("back2");
gStyle->SetOptStat(0);
auto *s = new TSpectrum2();
for (i = 0; i < nbinsx; i++){
for (j = 0; j < nbinsy; j++){
source[i][j] = back->GetBinContent(i + 1,j + 1);
}
}
s->Background(source,nbinsx,nbinsy,8,8,TSpectrum2::kBackIncreasingWindow,TSpectrum2::kBackSuccessiveFiltering);
for (i = 0; i < nbinsx; i++){
for (j = 0; j < nbinsy; j++)
back->SetBinContent(i + 1,j + 1, source[i][j]);
}
back->Draw("SURF2");
Info in <TCanvas::MakeDefCanvas>: created default TCanvas with name c1
Draw all canvases
gROOT->GetListOfCanvases()->Draw()