Logo ROOT  
Reference Guide
ratioplot3.py File Reference

Namespaces

 ratioplot3
 

Detailed Description

View in nbviewer Open in SWAN 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.