Hi Martin, Use MakeClass or MakeSelector if you want to produce many histograms in one go. Rene Brun Martin Turner wrote: > > Hello! > > I have a tree which I use to produce a second tree with a > different number of entries, for example looping over events in the first > and then tracksxevents in the second. Currently if my histograms take 100 > seconds to make and I want 10 of them then I am waiting 1000 seconds since > Draw appears to do a seperate loop for each plot. This is much slower than > sticking to the first tree, do one loop and fill the histograms as you go. > Is there a neat way to link histograms together using TTree so that I > don't have to wait for 10 loops, or is it necessary to use MakeClass? > > Martin
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