Logo ROOT  
Reference Guide
ratioplot3.C File Reference

Detailed Description

View in nbviewer Open in SWAN
Example which shows how you can get the graph of the lower plot and set the y axis range for it.

Since the lower plot is not created until TRatioPlot::Draw is called, you can only use the method afterwards.

void ratioplot3() {
auto c1 = new TCanvas("c1", "fit residual simple");
c1->SetLogy();
auto h1 = new TH1D("h1", "h1", 50, -5, 5);
h1->FillRandom("gaus", 2000);
h1->Fit("gaus", "0");
h1->SetMinimum(0.001);
h1->GetXaxis()->SetTitle("x");
h1->GetYaxis()->SetTitle("y");
auto rp1 = new TRatioPlot(h1);
rp1->Draw();
rp1->GetLowerRefGraph()->SetMinimum(-2);
rp1->GetLowerRefGraph()->SetMaximum(2);
}
R__EXTERN TStyle * gStyle
Definition: TStyle.h:414
The Canvas class.
Definition: TCanvas.h:23
1-D histogram with a double per channel (see TH1 documentation)}
Definition: TH1.h:620
TAxis * GetXaxis()
Definition: TH1.h:322
virtual void FillRandom(const char *fname, Int_t ntimes=5000, TRandom *rng=nullptr)
Fill histogram following distribution in function fname.
Definition: TH1.cxx:3513
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:3894
TAxis * GetYaxis()
Definition: TH1.h:323
virtual void SetMinimum(Double_t minimum=-1111)
Definition: TH1.h:401
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:43
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:1589
return c1
Definition: legend1.C:41
TH1F * h1
Definition: legend1.C:5
Author
Paul Gessinger

Definition in file ratioplot3.C.