ROOTers, I've some problem with filling predefined histograms from ntuples (projecting ntuples into histograms): my_ntuple->Draw("some_quantity >> my_histo", "some_selection") seems to use ONLY selfdefined temporary histograms. When I tried to instantiate the histogram before it is used in the command above, nothing happens (I can't Draw() the histogram afterwards: canvas stays empty). I would like to use predefined histograms to get a special binning. Also the command my_ntuple->Project("my_histo", "some_quantity", "some_selection") does not work in that way, albeit there is some indication from the (at this point vague) documentation that it should. And another question: Should Project() work like ntuple/project in Paw, e.g. the projection is only _added_ to the histogram contents (no reset)? I've tried with 1.03/01 for AIX 4.1 and 1.02/00 for Solaris 2.4. Tschuess, Thomas Kraemerkaemper.
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