I am trying to add two histograms that I generated with TTree::Draw. The commands I typed are as follows: TFile f("atlfast.root"); TTree *t1 = (TTree*)f.Get("Atlfast/50"); t1->Draw("APHOE>>h1"); t1->Draw("BPHOE>>h2"); h1->Add(h2); When I attempt to add the histograms I get the following: Error: Symbol h2 is not defined in current scope FILE:/tmp/filewYtM0M_cint LINE:1 *** Interpreter error recovered *** Why is h2 not defined in current scope? For that matter what is the current scope? My knowledge of C++ is quite rudimentary so excuse me if the answer to this is obvious. Matthew Wood
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