Hello ROOTers, I am trying to copy a fraction of the events in a ntuple file(HBOOK format) into a new tree. my program looks like this: THbookTree oldTree = new THbookFile("input.ntpl",4096); TTree *newTree = oldTree->CloneTree(0); Int_t nentries = oldTree->GetEntries(); for (Int_t i=0;i<nentries;i++) { oldTree->GetEvent(i); newTree->Fill(); } This dosn't work. If I convert the input.ntpl to input.root by h2root and replace the first line to TTree oldTree = new TFile("input.root"); then it works fine. But I don't want to convert all my ntpl file to root format. ... Thanks in advance. Yupeng Xu
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