Hi again, Can anyone tell me why this doesn't work, and what I have to do instead? root [4] TFile *hfile = new TFile("xsec_m030_161.root","UPDATE"); root [5] .ls TFile** xsec_m030_161.root TFile* xsec_m030_161.root KEY: TTree T;2 A simple ROOT tree KEY: TTree T;1 A simple ROOT tree KEY: TH2F h1;1 Total Cross-sections at 161 GeV KEY: TH2F h2;1 Right-handed Cross-sections at 161 GeV root [7] hfile->ls(); TFile** xsec_m030_161.root TFile* xsec_m030_161.root KEY: TTree T;2 A simple ROOT tree KEY: TTree T;1 A simple ROOT tree KEY: TH2F h1;1 Total Cross-sections at 161 GeV KEY: TH2F h2;1 Right-handed Cross-sections at 161 GeV root [8] hfile->Purge(); Deleting key :T at address 1282149 Nbytes=6393 *** Break *** segmentation violation ?????? Thanks, Chris. --- Chris Green. HEP, University of Liverpool MAIL Chris.Green@cern.ch, WWW http://hep.ph.liv.ac.uk/~chris/ +41 22 767 8075. On LTA at CERN. --- "I wouldn't give it to a dog, and I *am* one." -- Gaspode the wonder dog (Terry Pratchett, Moving Pictures)
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