Daer Roottalk, I have a TF2 that I evaluate with several different sets of parameters within a macro. I would like to write to a root file a histogram of this function for each of these parameter sets, in order to read them in and plot them in a different macro. Plotting them within the original macro can be done via TF2::DrawCopy. How do I address these histograms in order to write them out? I naively tried to shortcircuit the hitsogramming by trying to use the Write method on my TF2, i.e. TF2 *f2 = new TF2 (.....) .... f2->Write(); f2 is written to the root file, but when I open the file and do f2->Draw(), the resulting histogram is empty. (This technique works for TF1, by the way, in contrast to TF2.) Thanks, Peter Jacobs, LBNL
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