I would like to allow for cleaning up histograms, so I loop over the objects in gDirectory->GetList() and make a TObjArray of those inheriting from TH1 (is there a better way?). Then from this list I can Reset() them or delete them. If I delete them, I find that, when I redefine the same histogram, it appears to go through the fill OK, but when I go to draw it, I get a seg fault. I'm wondering if Root keeps its own list of histograms and doesn't realize that I have deleted it. Is there a safe way to delete the histograms? Thanks, Richard -- Richard Dubois SLD, Stanford Linear Accelerator Center Richard@slac.stanford.edu http://www.slac.stanford.edu/~richard/ 650-926-3824 650-926-2923 (FAX)
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