Hi, I have find the problem with TClonesArray, the problem is that I can not use TObjString. in splict mode. While in user guide I know that TString can not be used, it does not say I can not use TObjString. Further more, if I use TClonesArray::Delete instead of TClonesArray::Clear, I get segmantation fault. Another question is that can we use TTree in update mode? That mean we read the TTree from a TFile, add a branch, modify some leaves and write it back. Of course we can read the old TTree and write a new TTree, but for large files it will be both space and time consuming. Thanks with regards Haitao
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