Example showing a fit residual plot, where the separation margin has been set to 0. The last label of the lower plot's y axis is hidden automatically.
Author: Paul Gessinger
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Wednesday, April 17, 2024 at 11:13 AM.
gStyle->SetOptStat(0);
auto c1 = new TCanvas("c1", "fit residual simple");
gPad->SetFrameFillStyle(0);
auto h1 = new TH1D("h1", "h1", 50, -5, 5);
h1->FillRandom("gaus", 5000);
TFitResultPtr fitres = h1->Fit("gaus", "S0");
h1->Sumw2();
h1->GetXaxis()->SetTitle("x");
h1->GetYaxis()->SetTitle("y");
auto rp1 = new TRatioPlot(h1, "errfunc");
rp1->SetGraphDrawOpt("L");
rp1->SetSeparationMargin(0.0);
rp1->Draw();
rp1->GetLowerRefGraph()->SetMinimum(-2);
rp1->GetLowerRefGraph()->SetMaximum(2);
**************************************** Minimizer is Minuit2 / Migrad Chi2 = 29.7219 NDf = 34 Edm = 7.65715e-08 NCalls = 55 Constant = 395.847 +/- 6.87936 Mean = 0.00695631 +/- 0.0142942 Sigma = 1.00274 +/- 0.0101683 (limited)
Draw all canvases
gROOT->GetListOfCanvases()->Draw()