hist034_TRatioPlot_fit_margin.C

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/// \file
/// \ingroup tutorial_hist
/// \notebook
/// \preview Example showing a fit residual plot, where the separation margin has been set to 0.
/// The last label of the lower plot's y axis is hidden automatically.
///
/// \macro_image
/// \macro_code
///
/// \date January 2020
/// \author Paul Gessinger
 
void hist034_TRatioPlot_fit_margin()
{
   gStyle->SetOptStat(0);
   auto c1 = new TCanvas("c1", "fit residual simple");
   gPad->SetFrameFillStyle(0);
   auto h1 = new TH1D("h1", "h1", 50, -5, 5);
   h1->FillRandom("gaus", 5000);
   TFitResultPtr fitres = h1->Fit("gaus", "S0");
   h1->Sumw2();
   h1->GetXaxis()->SetTitle("x");
   h1->GetYaxis()->SetTitle("y");
   auto rp1 = new TRatioPlot(h1, "errfunc");
   rp1->SetGraphDrawOpt("L");
   rp1->SetSeparationMargin(0.0);
   rp1->Draw();
   rp1->GetLowerRefGraph()->SetMinimum(-2);
   rp1->GetLowerRefGraph()->SetMaximum(2);
}