Median of histogram

ROOT
5

The “median” is just the “0.5 quantile”:

{
  // create, fill and draw the histogram
  TF1 *f = new TF1("f", "TMath::Gaus(x, 5, 1)", 0, 10);
  TH1D *h = new TH1D("h", "h", 100, 0, 10);
  h->FillRandom("f");
  h->Draw();
  // calculate and print the "median"
  Double_t x, q;
  q = 0.5; // 0.5 for "median"
  h->ComputeIntegral(); // just a precaution
  h->GetQuantiles(1, &x, &q);
  std::cout << "median = " << x << std::endl;
}
2 Likes