hist031_TRatioPlot_residual_fit.C

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/// \file
/// \ingroup tutorial_hist
/// \notebook
/// \preview 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.
///
/// \macro_image
/// \macro_code
///
/// \date January 2020
/// \author Paul Gessinger
 
void hist031_TRatioPlot_residual_fit()
{
   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);
}