Logo ROOT   6.12/07
Reference Guide
ratioplot2.C File Reference

Detailed Description

View in nbviewer Open in SWAN 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.

pict1_ratioplot2.C.png
void ratioplot2() {
auto c1 = new TCanvas("c1", "fit residual simple");
auto h1 = new TH1D("h1", "h1", 50, -5, 5);
h1->FillRandom("gaus", 2000);
h1->Fit("gaus");
h1->GetXaxis()->SetTitle("x");
c1->Clear(); // Fit does not draw into correct pad
auto rp1 = new TRatioPlot(h1);
rp1->Draw();
rp1->GetLowerRefYaxis()->SetTitle("ratio");
rp1->GetUpperRefYaxis()->SetTitle("entries");
c1->Update();
}
Author
Paul Gessinger

Definition in file ratioplot2.C.