Hi Niels, You can produce an ascii file directly with tree.Scan("var1:var2","some selection"); >subtree.dat or create a new Tree with the subsets. See an example in tutorial $ROOTSYS/tutorials/copytree3.C Rene Brun Niels Madsen wrote: > > Dear Rooters, > > I have an ntuple and I wish to output a simple list (ascii file) with > two of it's > parameters, applying a specific cut. Does anyone know how to do this ? > I presume that one way would be to generate a second ntuple with the > cut applied and run though this ntuple - but I can't figure out how to > do > that ??? > > Thanks, > Niels Madsen > > ----------------------------------------- > Dr. Niels Madsen > Department of Physics > University of Aarhus > DK-8000 Aarhus C > Denmark > > Stationed at : > CERN - PH/UAD - 545-R-018 > CH-1211 Geneva 23 > Switzerland > Tel. +41 22 767 2387 Fax. +41 22 767 8955 > Lab. +41 22 767 9814 Mob. +41 76 487 0835 > >
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