Hi Christian, The procedure to merge ROOT Trees is described in TChain::Merge. See: http://root.cern.ch/root/htmldoc/TChain.html#TChain:Merge If you have files named file1.root,file2.root,file3.root, containing a Tree "T", do TChain ch("T"); ch.Add("file1.root"); ch.Add("file2.root"); ch.Add("file3.root"); ch.Merge("big.root"); Rene Brun Christian Schmitt wrote: > > Hi ROOTers, > > I have the following problem: I need to merge several hundred files, each > containing the same tree. The total size is something like 10 GB. > So I cannot use just TChain::Merge because of the 2GB limit of root-files. > > Now my wuestion is: how can I merge the files such that ideally I get 5 to 6 > files with each having a filesize < 2GB ? > > It should be a solution which works in general, i.e. doesn't make an > asumption on the structure of the tree in the files (the only thing known is > that the trees are simple trees, i.e. only integers, or floats are stored). > > Thanks for your help, > > Christian Schmitt
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