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.
Author: Paul Gessinger
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Wednesday, April 17, 2024 at 11:13 AM.
gStyle->SetOptStat(0);
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);
**************************************** Minimizer is Minuit2 / Migrad Chi2 = 22.1778 NDf = 33 Edm = 6.53577e-08 NCalls = 55 Constant = 158.988 +/- 4.47298 Mean = 0.00662197 +/- 0.0225355 Sigma = 0.993481 +/- 0.0169678 (limited)
Draw all canvases
gROOT->GetListOfCanvases()->Draw()