Logo ROOT   6.18/05
Reference Guide
Background_width.C File Reference

Detailed Description

View in nbviewer Open in SWAN Example to illustrate the influence of the clipping window width on the estimated background.

void Background_width() {
Int_t i;
const Int_t nbins = 1024;
Double_t xmax = nbins;
Double_t source[nbins];
gROOT->ForceStyle();
TString dir = gROOT->GetTutorialDir();
TString file = dir+"/spectrum/TSpectrum.root";
TFile *f = new TFile(file.Data());
TH1F *back = (TH1F*) f->Get("back1");
TH1F *d1 = new TH1F("d1","",nbins,xmin,xmax);
TH1F *d2 = new TH1F("d2","",nbins,xmin,xmax);
TH1F *d3 = new TH1F("d3","",nbins,xmin,xmax);
back->GetXaxis()->SetRange(1,nbins);
back->SetTitle("Influence of clipping window width on the estimated background");
back->Draw("L");
TSpectrum *s = new TSpectrum();
for (i = 0; i < nbins; i++) source[i]=back->GetBinContent(i + 1);
s->Background(source,nbins,4,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,6,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,8,TSpectrum::kBackDecreasingWindow,
for (i = 0; i < nbins; i++) d3->SetBinContent(i + 1,source[i]);
d3->Draw("SAME L");
}
#define f(i)
Definition: RSha256.hxx:104
int Int_t
Definition: RtypesCore.h:41
const Bool_t kFALSE
Definition: RtypesCore.h:88
double Double_t
Definition: RtypesCore.h:55
@ kRed
Definition: Rtypes.h:64
@ kOrange
Definition: Rtypes.h:65
@ kGreen
Definition: Rtypes.h:64
float xmin
Definition: THbookFile.cxx:93
float xmax
Definition: THbookFile.cxx:93
#define gROOT
Definition: TROOT.h:414
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 from bin first to last.
Definition: TAxis.cxx:903
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:48
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:6309
TAxis * GetXaxis()
Get the behaviour adopted by the object about the statoverflows. See EStatOverflows for more informat...
Definition: TH1.h:316
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:8635
virtual void Draw(Option_t *option="")
Draw this histogram with options.
Definition: TH1.cxx:2981
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition: TH1.cxx:4882
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:131
static constexpr double s
Definition: file.py:1
Authors
Miroslav Morhac, Olivier Couet

Definition in file Background_width.C.