Hi Stephen, You can do this via TTree::CloneTree. see http://root.cern.ch/root/html/TTree.html#TTree:CloneTree we provide examples in the tutorials copytree and copytree2 See URLs: http://root.cern.ch/root/html/examples/copytree.C.html http://root.cern.ch/root/html/examples/copytree2.C.html You can easily adapt these two examples to your case. Rene Brun Stephen Markacs wrote: > > I have three different root files, each with one TNtuple in it. The > ntuples are entirely different ntuples. I want to make one file that has > all three of the TNtuples in it - that is, I don't want to merge the > ntuples, I just want the three to appear individually all in the same > file. Is there a straightforward way to do this? > > S t e p h e n M a r k a c s > stephen@phys.columbia.edu > http://phys.columbia.edu/~stephen/
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