hist008_TH1_zoom.C File Reference

Detailed Description

Changing the Range on the X-Axis of a Histogram

Image produced by .x ZoomHistogram.C

This demonstrates how to zoom into a histogram by changing the range on one of the axes (or both).

 
void hist008_TH1_zoom()
{
   // Create and fill a histogram
   TH1F *orig = new TH1F("Normal Histogram", "Normal Histogram", 100, 0, 100);
 
   TRandom3 rng;
   for (int i = 0; i < 1000; ++i) {
      double x = rng.Gaus(50, 10);
      orig->Fill(x);
   }
 
   // Clone the histogram into one called "zoom"
   TH1F *zoom = static_cast<TH1F *>(orig->Clone("zoom"));
   zoom->SetTitle("Zoomed-in Histogram");
   // "Zoom" in the histogram by setting a new range to the X axis
   zoom->GetXaxis()->SetRangeUser(50, 100);
 
   // Draw both histograms to a canvas
   TCanvas *c1 = new TCanvas("c1", "Histogram", 1500, 700);
   // split the canvas horizontally in 2
   int nsubdivX = 2;
   int nsubdivY = 1;
   c1->Divide(nsubdivX, nsubdivY);
 
   c1->cd(1);
   orig->Draw();
   c1->cd(2);
   zoom->Draw();
}

Date

November 2024

Author

Advait Dhingra

Definition in file hist008_TH1_zoom.C.