Dear RooTers, It is possible a very beginner question, but I don't know the solution. I have several directory. All of them contains many data, which are analized directory by directory, so after the analysis in every directory conains a root file also. In the root files there are two histogram. I would need to the "same" histogram from every directory. The problem is, if I do this: { TFile* File1 = new TFile("one.root"); TH2D* OneHisto = File1->Get("h2"); TFile* File12 = new TFile("two.root"); TH2D* TwoHisto = File1->Get("h2"); cout << OneHisto->GetNbinsX(); } I get error ... What can I do, What do I do wrong? Thanks, k.
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