ROOT   Reference Guide
ratioplot3.py
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1## \file
2## \ingroup tutorial_hist
3## \notebook
4## Example which shows how you can get the graph of the lower plot and set the y axis range for it.
5##
6## Since the lower plot is not created until TRatioPlot::Draw is called, you can only use the method
7## afterwards.
8## Inspired by the tutorial of Paul Gessinger.
9##
10## \macro_image
11## \macro_code
12##
13## \author Alberto Ferro
14
15import ROOT
16
17ROOT.gStyle.SetOptStat(0)
18c1 = ROOT.TCanvas("c1", "fit residual simple")
19c1.SetLogy()
20
21h1 = ROOT.TH1D("h1", "h1", 50, -5, 5)
22h1.FillRandom("gaus", 2000)
23h1.Fit("gaus")
24h1.SetMinimum(0.001)
25h1.GetXaxis().SetTitle("x")
26h1.GetYaxis().SetTitle("y")
27
28rp1 = ROOT.TRatioPlot(h1)
29rp1.Draw()
30rp1.GetLowerRefGraph().SetMinimum(-2)
31rp1.GetLowerRefGraph().SetMaximum(2)
32
33c1.Update()