# ratioplot2¶

Example of a fit residual plot.

Creates a histogram filled with random numbers from a gaussian distribution and fits it with a standard gaussian function. The result is passed to the TRatioPlot constructor. Additionally, after calling TRatioPlot::Draw the upper and lower y axis titles are modified. Confidence interval bands are automatically drawn on the bottom (but can be disabled by draw option nobands. Inspired by the tutorial of Paul Gessinger.

Author: Alberto Ferro
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Thursday, December 01, 2022 at 11:17 AM.

In [1]:
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")

rp1 = ROOT.TRatioPlot(h1)
rp1.Draw()
rp1.GetLowerRefYaxis().SetTitle("ratio")
rp1.GetUpperRefYaxis().SetTitle("entries")

c1.Update()

Welcome to JupyROOT 6.27/01


Draw all canvases

In [2]:
from ROOT import gROOT
gROOT.GetListOfCanvases().Draw()