Hi Rene and rooters, I am a bit lost with TTrees and TFile. What I want to do is quite simple. Assume I have a root file with a root tree and I want to open the file and add several entries in the tree. TFile *File = new TFile("trade.data", "update"); TTree *Tree = (TTree*) TFile->Get("IBM"); ... . ... Tree->Fill(); TTree->Write(); TFile->Close(); does the job but it writes a copy of the whole tree with only several new entries added. I can do TFile->Purge(); of course but it is not what I want to do. I want to make my trees on file and in memory identical, i.e. add several new entries to the same tree on disk without writing a new copy of the tree! Regards, Anton http://www.smartquant.com
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