Logo ROOT   6.10/09
Reference Guide
ratioplot3.C
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1 /// \file
2 /// \ingroup tutorial_hist
3 /// \notebook
4 /// Example which shows how you can get the graph of the lower plot and set the y axis range for it.
5 ///
6 /// Since the lower plot is not created until `TRatioPlot::Draw` is called, you can only use the method
7 /// afterwards.
8 ///
9 /// \macro_image
10 /// \macro_code
11 ///
12 /// \author Paul Gessinger
13 
14 void ratioplot3() {
15  gStyle->SetOptStat(0);
16  auto c1 = new TCanvas("c1", "fit residual simple");
17  c1->SetLogy();
18  auto h1 = new TH1D("h1", "h1", 50, -5, 5);
19  h1->FillRandom("gaus", 2000);
20  h1->Fit("gaus");
21  h1->SetMinimum(0.001);
22  h1->GetXaxis()->SetTitle("x");
23  h1->GetYaxis()->SetTitle("y");
24  c1->Clear();
25  auto rp1 = new TRatioPlot(h1);
26  rp1->Draw();
27  rp1->GetLowerRefGraph()->SetMinimum(-2);
28  rp1->GetLowerRefGraph()->SetMaximum(2);
29  c1->Update();
30 }
return c1
Definition: legend1.C:41
R__EXTERN TStyle * gStyle
Definition: TStyle.h:402
virtual void SetMinimum(Double_t minimum=-1111)
Definition: TH1.h:376
TH1F * h1
Definition: legend1.C:5
virtual void FillRandom(const char *fname, Int_t ntimes=5000)
Fill histogram following distribution in function fname.
Definition: TH1.cxx:3294
TAxis * GetYaxis()
Definition: TH1.h:301
The Canvas class.
Definition: TCanvas.h:31
void SetOptStat(Int_t stat=1)
The type of information printed in the histogram statistics box can be selected via the parameter mod...
Definition: TStyle.cxx:1267
THist< 1, double, THistStatContent, THistStatUncertainty > TH1D
Definition: THist.hxx:310
Class for displaying ratios, differences and fit residuals.
Definition: TRatioPlot.h:44
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition: TNamed.cxx:155
virtual TFitResultPtr Fit(const char *formula, Option_t *option="", Option_t *goption="", Double_t xmin=0, Double_t xmax=0)
Fit histogram with function fname.
Definition: TH1.cxx:3564
TAxis * GetXaxis()
Definition: TH1.h:300