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Reference Guide
Background_width2.C File Reference

Detailed Description

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Example to illustrate the influence of the clipping window width on the estimated background.

void Background_width2() {
Int_t i;
const Int_t nbins = 4096;
Double_t xmax = 4096;
Double_t source[nbins];
gROOT->ForceStyle();
TH1F *d1 = new TH1F("d1","",nbins,xmin,xmax);
TH1F *d2 = new TH1F("d2","",nbins,xmin,xmax);
TH1F *d3 = new TH1F("d3","",nbins,xmin,xmax);
TH1F *d4 = new TH1F("d4","",nbins,xmin,xmax);
TString dir = gROOT->GetTutorialDir();
TString file = dir+"/spectrum/TSpectrum.root";
TFile *f = new TFile(file.Data());
TH1F *back = (TH1F*) f->Get("back2");
back->SetTitle("Influence of clipping window width on the estimated background");
back->SetAxisRange(0,1000);
back->SetMaximum(7000);
back->Draw("L");
TSpectrum *s = new TSpectrum();
for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
s->Background(source,nbins,10,TSpectrum::kBackDecreasingWindow,
for (i = 0; i < nbins; i++) d1->SetBinContent(i + 1,source[i]);
d1->Draw("SAME L");
for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
s->Background(source,nbins,20,TSpectrum::kBackDecreasingWindow,
for (i = 0; i < nbins; i++) d2->SetBinContent(i + 1,source[i]);
d2->Draw("SAME L");
for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
s->Background(source,nbins,30,TSpectrum::kBackDecreasingWindow,
for (i = 0; i < nbins; i++) d3->SetBinContent(i + 1,source[i]);
d3->Draw("SAME L");
for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
s->Background(source,nbins,40,TSpectrum::kBackDecreasingWindow,
for (i = 0; i < nbins; i++) d4->SetBinContent(i + 1,source[i]);
d4->Draw("SAME L");
}
#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
@ kGreen
Definition: Rtypes.h:66
@ kMagenta
Definition: Rtypes.h:66
@ kBlue
Definition: Rtypes.h:66
float xmin
Definition: THbookFile.cxx:95
float xmax
Definition: THbookFile.cxx:95
#define gROOT
Definition: TROOT.h:404
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
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
virtual void SetMaximum(Double_t maximum=-1111)
Definition: TH1.h:397
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3060
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:9089
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:5025
virtual void SetAxisRange(Double_t xmin, Double_t xmax, Option_t *axis="X")
Set the "axis" range.
Definition: Haxis.cxx:201
Advanced Spectra Processing.
Definition: TSpectrum.h:18
@ kBackOrder2
Definition: TSpectrum.h:37
@ kBackDecreasingWindow
Definition: TSpectrum.h:42
@ 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_width2.C.