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Reference Guide
Background_decr.C File Reference

Detailed Description

View in nbviewer Open in SWAN Example to illustrate the background estimator (class TSpectrum).

void Background_decr() {
Int_t i;
const Int_t nbins = 1024;
Double_t xmax = nbins;
Double_t source[nbins];
gROOT->ForceStyle();
TH1F *d = new TH1F("d","",nbins,xmin,xmax);
TString dir = gROOT->GetTutorialDir();
TString file = dir+"/spectrum/TSpectrum.root";
TFile *f = new TFile(file.Data());
TH1F *back = (TH1F*) f->Get("back1");
back->SetTitle("Estimation of background with decreasing window");
back->GetXaxis()->SetRange(1,nbins);
back->Draw("L");
TSpectrum *s = new TSpectrum();
for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
// Estimate the background
s->Background(source,nbins,6,TSpectrum::kBackDecreasingWindow,
// Draw the estimated background
for (i = 0; i < nbins; i++) d->SetBinContent(i + 1,source[i]);
d->SetLineColor(kRed);
d->Draw("SAME L");
}
#define d(i)
Definition: RSha256.hxx:102
#define f(i)
Definition: RSha256.hxx:104
int Int_t
Definition: RtypesCore.h:41
const Bool_t kFALSE
Definition: RtypesCore.h:88
double Double_t
Definition: RtypesCore.h:55
@ kRed
Definition: Rtypes.h:64
float xmin
Definition: THbookFile.cxx:93
float xmax
Definition: THbookFile.cxx:93
#define gROOT
Definition: TROOT.h:414
virtual void SetRange(Int_t first=0, Int_t last=0)
Set the viewing range for the axis from bin first to last.
Definition: TAxis.cxx:903
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:48
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:571
virtual void SetTitle(const char *title)
See GetStatOverflows for more information.
Definition: TH1.cxx:6309
TAxis * GetXaxis()
Get the behaviour adopted by the object about the statoverflows. See EStatOverflows for more informat...
Definition: TH1.h:316
virtual void Draw(Option_t *option="")
Draw this histogram with options.
Definition: TH1.cxx:2981
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:4882
Advanced Spectra Processing.
Definition: TSpectrum.h:18
@ kBackOrder2
Definition: TSpectrum.h:37
@ kBackDecreasingWindow
Definition: TSpectrum.h:42
@ kBackSmoothing3
Definition: TSpectrum.h:43
Basic string class.
Definition: TString.h:131
static constexpr double s
Definition: file.py:1
Authors
Miroslav Morhac, Olivier Couet

Definition in file Background_decr.C.