hist032_TRatioPlot_fit_lines.C

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/// \file
/// \ingroup tutorial_hist
/// \notebook
/// \preview Example that shows custom dashed lines on the lower plot, specified by a vector of floats.
///
/// By default, dashed lines are drawn at certain points. You can either disable them, or specify
/// where you want them to appear.
///
/// \macro_image
/// \macro_code
///
/// \date January 2020
/// \author Paul Gessinger
 
void hist032_TRatioPlot_fit_lines()
{
   gStyle->SetOptStat(0);
   auto c1 = new TCanvas("c1", "fit residual simple");
   auto h1 = new TH1D("h1", "h1", 50, -5, 5);
   h1->FillRandom("gaus", 2000);
   h1->Fit("gaus", "0");
   h1->GetXaxis()->SetTitle("x");
   h1->GetYaxis()->SetTitle("y");
   auto rp1 = new TRatioPlot(h1);
   std::vector<double> lines = {-3, -2, -1, 0, 1, 2, 3};
   rp1->SetGridlines(lines);
   rp1->Draw();
   rp1->GetLowerRefGraph()->SetMinimum(-4);
   rp1->GetLowerRefGraph()->SetMaximum(4);
}