Get total energy from an histogram

[Wile_E_Coyote]

Histogram sum

Try (sensitive to user’s changes to the current x-axis range): std::cout << h->GetMean() * h->Integral() << "\n"; // mean * integral and/or (valid only for the “entire” x-axis range): std::cout << h->GetMean() * h->GetSumOfWeights() << "\n"; Another good idea would be (sensitive to user’s changes to the current x-axis range): // change the x-axis range, if desired, and then ... Double_t stats[(TH1::kNstat)]; // sums of w, w^2, w*x, w*x^2, ... h->GetStats(stats); std::cout << stats[2] << "\n…