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Background_incr.C File Reference

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Example to illustrate the background estimator (class TSpectrum).

void Background_incr() {
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->GetXaxis()->SetRange(1,nbins);
back->SetTitle("Estimation of background with increasing window");
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::kBackIncreasingWindow,
// 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:45
const Bool_t kFALSE
Definition: RtypesCore.h:101
double Double_t
Definition: RtypesCore.h:59
@ kRed
Definition: Rtypes.h:66
float xmin
Definition: THbookFile.cxx:95
float xmax
Definition: THbookFile.cxx:95
#define gROOT
Definition: TROOT.h:404
virtual void SetRange(Int_t first=0, Int_t last=0)
Set the viewing range for the axis using bin numbers.
Definition: TAxis.cxx:952
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:54
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:574
void SetTitle(const char *title) override
Change (i.e.
Definition: TH1.cxx:6700
TAxis * GetXaxis()
Definition: TH1.h:319
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3060
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:5025
Advanced Spectra Processing.
Definition: TSpectrum.h:18
@ kBackOrder2
Definition: TSpectrum.h:37
@ kBackIncreasingWindow
Definition: TSpectrum.h:41
@ kBackSmoothing3
Definition: TSpectrum.h:43
Basic string class.
Definition: TString.h:136
static constexpr double s
Definition: file.py:1
Authors
Miroslav Morhac, Olivier Couet

Definition in file Background_incr.C.