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hist031_TRatioPlot_residual_fit.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/// \date January 2020
13/// \author Paul Gessinger
14
16{
18 auto c1 = new TCanvas("c1", "fit residual simple");
19 c1->SetLogy();
20 auto h1 = new TH1D("h1", "h1", 50, -5, 5);
21 h1->FillRandom("gaus", 2000);
22 h1->Fit("gaus", "0");
23 h1->SetMinimum(0.001);
24 h1->GetXaxis()->SetTitle("x");
25 h1->GetYaxis()->SetTitle("y");
26 auto rp1 = new TRatioPlot(h1);
27 rp1->Draw();
28 rp1->GetLowerRefGraph()->SetMinimum(-2);
29 rp1->GetLowerRefGraph()->SetMaximum(2);
30}
R__EXTERN TStyle * gStyle
Definition TStyle.h:442
The Canvas class.
Definition TCanvas.h:23
1-D histogram with a double per channel (see TH1 documentation)
Definition TH1.h:693
virtual void FillRandom(TF1 *f1, Int_t ntimes=5000, TRandom *rng=nullptr)
Definition TH1.cxx:3499
TAxis * GetXaxis()
Definition TH1.h:340
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:3875
TAxis * GetYaxis()
Definition TH1.h:341
virtual void SetMinimum(Double_t minimum=-1111)
Definition TH1.h:421
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition TNamed.cxx:164
Class for displaying ratios, differences and fit residuals.
Definition TRatioPlot.h:44
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:1642
return c1
Definition legend1.C:41
TH1F * h1
Definition legend1.C:5