Hello, I have been working on the plot of a histogram. I use the Scale method to normalize the graph so that the y-coordinate behaves as the probability density instead of frequency. However, when I draw the error bar of this graph by using Draw->(“E1”), the error bar becomes so big. Is there a way…

Wile_E_Coyote February 27, 2018, 9:22am 6

Different ways of normalizing histograms ROOT

Hi everyone, I’m a new user of both ROOT and RootTalk so please pardon my ignorance. I’ve been trying to normalize several histograms, and when I search in RootTalk, a multitude of ways comes up. How do I know which one is “right”? What is the difference between the following methods? Here are the 4 methods I tried: Method 1: Double_t num = h->GetBinContent(i); Double_t den = h->GetBinWidth(i); Double_t value = 0; if (den!=0) { value = num/den; h->SetBinContent(i,value); } Met…

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Error bar too large for histogram