Dear rooters, I want to copy some sub directories from different root files in one root file. But I got always the " *****break segment violation*****". Maybe I did it in a wrong way. Could you please give me a hand? The system is AIX4.3.3, the root version is v3.01-6 and the code is as following: TFile f(calmonbha_in); TTree *oldtree = (TTree*) f.Get("h10005"); TFile *fout = new TFile(current_out, "recreate"); //TTree *newtree = oldtree->CloneTree(); neither Clone tree works TTree *newtree = oldtree->CopyTree("h10005"); newtree->Write(); fout->Write(); Here in the code I got one histogram only for test. I need to copy whole directory named "GENERAL;1". "h10005" is only one of the histograms inside the directory. I have also attempted to use TDirectory::Get() but fail too. Best Wen Mei
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