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Background_decr.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_decr() {
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->SetTitle("Estimation of background with decreasing window");
26 back->GetXaxis()->SetRange(1,nbins);
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
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:45
constexpr Bool_t kFALSE
Definition RtypesCore.h:101
double Double_t
Definition RtypesCore.h:59
@ kRed
Definition Rtypes.h:66
float xmin
float xmax
#define gROOT
Definition TROOT.h:407
virtual void SetRange(Int_t first=0, Int_t last=0)
Set the viewing range for the axis using bin numbers.
Definition TAxis.cxx:1052
A ROOT file is an on-disk file, usually with extension .root, that stores objects in a file-system-li...
Definition TFile.h:53
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:621
void SetTitle(const char *title) override
Change/set the title.
Definition TH1.cxx:6686
TAxis * GetXaxis()
Definition TH1.h:324
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3066
virtual void SetBinContent(Int_t bin, Double_t content)
Set bin content see convention for numbering bins in TH1::GetBin In case the bin number is greater th...
Definition TH1.cxx:9190
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition TH1.cxx:5029
Advanced Spectra Processing.
Definition TSpectrum.h:18
virtual TH1 * Background(const TH1 *hist, Int_t niter=20, Option_t *option="")
One-dimensional background estimation function.
@ kBackOrder2
Definition TSpectrum.h:37
@ kBackDecreasingWindow
Definition TSpectrum.h:42
@ kBackSmoothing3
Definition TSpectrum.h:43
Basic string class.
Definition TString.h:139
const char * Data() const
Definition TString.h:376