Hi, I have followed Rene's advice and am trying to write out a root tree from within some c++ code.. The class i have written can be found under: /afs/cern.ch/user/d/dholmes/public/rootTree.cc /afs/cern.ch/user/d/dholmes/public/rootTree.h I run my methods in the order: costructor..opens the tree (successful) BeamParamsFill ..ok??! EvtFill ..crashes.. The problem comes at line 28 of the .cc file, in short i don't seem to be able to message the tree ptr t1 that i set up and tested in a previous method?? I don't know if my mistake is root or c++ based so apologies if its the latter.. Any thoughts/advice is much appreciated. cheers, Dan. CMS-Bristol http://cern.ch/dan.holmes
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