ratioplot4.py

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## \file
## \ingroup tutorial_hist
## \notebook
## 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.
## Inspired by the tutorial of Paul Gessinger.
##
## \macro_image
## \macro_code
##
## \author Alberto Ferro
 
import ROOT
 
ROOT.gStyle.SetOptStat(0)
 
c1 = ROOT.TCanvas("c1", "fit residual simple")
h1 = ROOT.TH1D("h1", "h1", 50, -5, 5)
h1.FillRandom("gaus", 2000)
h1.Fit("gaus")
h1.GetXaxis().SetTitle("x")
h1.GetYaxis().SetTitle("y")
 
rp1 = ROOT.TRatioPlot(h1)
 
lines = ROOT.std.vector('double')()
for i in range(-3,4):lines.push_back(i)
rp1.SetGridlines(lines)
 
rp1.Draw()
rp1.GetLowerRefGraph().SetMinimum(-4)
rp1.GetLowerRefGraph().SetMaximum(4)
 
c1.Update()