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. Inspired by the tutorial of Paul Gessinger.
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import ROOT
ROOT.gStyle.SetOptStat(0)
c1 = ROOT.TCanvas("c1", "fit residual simple")
c1.SetLogy()
h1 = ROOT.TH1D("h1", "h1", 50, -5, 5)
h1.FillRandom("gaus", 2000)
h1.Fit("gaus")
h1.SetMinimum(0.001)
h1.GetXaxis().SetTitle("x")
h1.GetYaxis().SetTitle("y")
rp1 = ROOT.TRatioPlot(h1)
rp1.Draw()
rp1.GetLowerRefGraph().SetMinimum(-2)
rp1.GetLowerRefGraph().SetMaximum(2)
c1.Update()
- Author
- Alberto Ferro
Definition in file hist031_TRatioPlot_residual_fit.py.
