Hi All I am using version 2.25/01 and I want to add a bunch of 2d histograms together, and so I assumed that I could use something like I would for 1d histograms... TH2F h1, h2; Double_t c; ... h1.Add(h2,1); // h1 = h1 + c*h2; However, I find that Add isn't overloaded for TH2 and so it is expecting a TH1 for the first arguement of Add(). Is this a bug, am I missing something obvious, or does the Add() for TH2 simply not exist? How can I get this 'histogram increment' functionality for 2d histograms? Jeff
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