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Background_width.C
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1/// \file
2/// \ingroup tutorial_spectrum
3/// Example to illustrate the influence of the clipping window width on the
4/// estimated background.
5///
6/// \macro_image
7/// \macro_code
8///
9/// \authors Miroslav Morhac, Olivier Couet
10
12{
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 + "/legacy/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++)
35 source[i] = back->GetBinContent(i + 1);
38 for (i = 0; i < nbins; i++)
39 d1->SetBinContent(i + 1, source[i]);
40 d1->SetLineColor(kRed);
41 d1->Draw("SAME L");
42
43 for (i = 0; i < nbins; i++)
44 source[i] = back->GetBinContent(i + 1);
47 for (i = 0; i < nbins; i++)
48 d2->SetBinContent(i + 1, source[i]);
49 d2->SetLineColor(kOrange);
50 d2->Draw("SAME L");
51
52 for (i = 0; i < nbins; i++)
53 source[i] = back->GetBinContent(i + 1);
56 for (i = 0; i < nbins; i++)
57 d3->SetBinContent(i + 1, source[i]);
58 d3->SetLineColor(kGreen);
59 d3->Draw("SAME L");
60}
#define f(i)
Definition RSha256.hxx:104
int Int_t
Definition RtypesCore.h:45
constexpr Bool_t kFALSE
Definition RtypesCore.h:94
double Double_t
Definition RtypesCore.h:59
@ kRed
Definition Rtypes.h:66
@ kOrange
Definition Rtypes.h:67
@ kGreen
Definition Rtypes.h:66
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
float xmin
float xmax
#define gROOT
Definition TROOT.h:406
virtual void SetRange(Int_t first=0, Int_t last=0)
Set the viewing range for the axis using bin numbers.
Definition TAxis.cxx:1053
A ROOT file is an on-disk file, usually with extension .root, that stores objects in a file-system-li...
Definition TFile.h:131
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:645
void SetTitle(const char *title) override
Change/set the title.
Definition TH1.cxx:6716
TAxis * GetXaxis()
Definition TH1.h:340
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3037
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition TH1.cxx:5059
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