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Background_incr.C
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1/// \file
2/// \ingroup tutorial_spectrum
3/// \notebook
4/// Example to illustrate the background estimator (class TSpectrum).
5///
6/// \macro_image
7/// \macro_code
8///
9/// \authors Miroslav Morhac, Olivier Couet
10
11void Background_incr() {
12 Int_t i;
13 const Int_t nbins = 1024;
14 Double_t xmin = 0;
15 Double_t xmax = nbins;
16 Double_t source[nbins];
17 gROOT->ForceStyle();
18
19 TH1F *d = new TH1F("d","",nbins,xmin,xmax);
20
21 TString dir = gROOT->GetTutorialDir();
22 TString file = dir+"/spectrum/TSpectrum.root";
23 TFile *f = new TFile(file.Data());
24 TH1F *back = (TH1F*) f->Get("back1");
25 back->GetXaxis()->SetRange(1,nbins);
26 back->SetTitle("Estimation of background with increasing window");
27 back->Draw("L");
28
29 TSpectrum *s = new TSpectrum();
30
31 for (i = 0; i < nbins; i++) source[i] = back->GetBinContent(i + 1);
32
33 // Estimate the background
34 s->Background(source,nbins,6,TSpectrum::kBackIncreasingWindow,
37
38 // Draw the estimated background
39 for (i = 0; i < nbins; i++) d->SetBinContent(i + 1,source[i]);
40 d->SetLineColor(kRed);
41 d->Draw("SAME L");
42}
#define d(i)
Definition: RSha256.hxx:102
#define f(i)
Definition: RSha256.hxx:104
int Int_t
Definition: RtypesCore.h:43
const Bool_t kFALSE
Definition: RtypesCore.h:90
double Double_t
Definition: RtypesCore.h:57
@ kRed
Definition: Rtypes.h:64
float xmin
Definition: THbookFile.cxx:93
float xmax
Definition: THbookFile.cxx:93
#define gROOT
Definition: TROOT.h:406
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:914
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:53
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:6345
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:2998
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:4907
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:131
static constexpr double s
Definition: file.py:1