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
).
Author: Paul Gessinger
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Monday, May 13, 2024 at 11:30 AM.
gStyle->SetOptStat(0);
auto c1 = new TCanvas("c1", "fit residual simple");
auto h1 = new TH1D("h1", "h1", 50, -5, 5);
h1->FillRandom("gaus", 2000);
h1->Fit("gaus", "0");
h1->GetXaxis()->SetTitle("x");
auto rp1 = new TRatioPlot(h1);
rp1->Draw();
rp1->GetLowerRefYaxis()->SetTitle("ratio");
rp1->GetUpperRefYaxis()->SetTitle("entries");
**************************************** Minimizer is Minuit2 / Migrad Chi2 = 22.1778 NDf = 33 Edm = 6.53577e-08 NCalls = 55 Constant = 158.988 +/- 4.47298 Mean = 0.00662197 +/- 0.0225355 Sigma = 0.993481 +/- 0.0169678 (limited)
Draw all canvases
gROOT->GetListOfCanvases()->Draw()