Hi. I am trying to use the 'hadd.C' macro in $ROOTSYS/tutorials to combine a series of files containing both histograms and ntuples. The program works fine in the case of histograms -- however I find that in the case of ntuples/trees what it creates is a chain of pointers to trees in files and not a new tree. So if I delete one of the files I used for merging I get an error like: Error in <TFile::TFile>: file ... does not exist I'm sure it is a very simple fix to this macro to have it save the actual tree to the file rather than the pointers to trees. Thanks. Matthew Wood
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