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Background_width.C
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1/// \file
2/// \ingroup tutorial_spectrum
3/// \notebook
4/// Example to illustrate the influence of the clipping window width on the
5/// estimated background.
6///
7/// \macro_image
8/// \macro_code
9///
10/// \authors Miroslav Morhac, Olivier Couet
11
12void Background_width() {
13 Int_t i;
14 const Int_t nbins = 1024;
15 Double_t xmin = 0;
16 Double_t xmax = nbins;
17 Double_t source[nbins];
18 gROOT->ForceStyle();
19
20 TString dir = gROOT->GetTutorialDir();
21 TString file = dir+"/spectrum/TSpectrum.root";
22 TFile *f = new TFile(file.Data());
23 TH1F *back = (TH1F*) f->Get("back1");
24 TH1F *d1 = new TH1F("d1","",nbins,xmin,xmax);
25 TH1F *d2 = new TH1F("d2","",nbins,xmin,xmax);
26 TH1F *d3 = new TH1F("d3","",nbins,xmin,xmax);
27
28 back->GetXaxis()->SetRange(1,nbins);
29 back->SetTitle("Influence of clipping window width on the estimated background");
30 back->Draw("L");
31
32 TSpectrum *s = new TSpectrum();
33
34 for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
38 for (i = 0; i < nbins; i++) d1->SetBinContent(i + 1,source[i]);
39 d1->SetLineColor(kRed);
40 d1->Draw("SAME L");
41
42 for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
46 for (i = 0; i < nbins; i++) d2->SetBinContent(i + 1,source[i]);
48 d2->Draw("SAME L");
49
50 for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
54 for (i = 0; i < nbins; i++) d3->SetBinContent(i + 1,source[i]);
56 d3->Draw("SAME L");
57}
#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
@ kOrange
Definition Rtypes.h:67
@ kGreen
Definition Rtypes.h:66
float xmin
float xmax
#define gROOT
Definition TROOT.h:406
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition TAttLine.h:40
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 composed of a header, followed by consecutive data records (TKey instances) with a wel...
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:6682
TAxis * GetXaxis()
Definition TH1.h:324
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3062
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:9187
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
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:378