ratioplot3.py File Reference

Detailed Description

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.

 
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 ratioplot3.py.