Dear Rooters, I have a problem creating branches in case each event consits of several TClonesArrays; this is the case C described in the TTree class manual. The constructor for creating branches of this type is TTree::Branch(const Text_t *name, TClonesArray *list, Int_t bufsize, Int_t split) Unfortunately, there is no example given for this method of how to create and fill a tree. I want to use this method because I don't want to store all the data of one event, but only a certain subset, e.g. tracks. For this purpose, method C seems apropriate. The event class I am using is similar to the famous class Event used in the ROOT tutorials, where the data member fTracks is a pointer to a TClonesArray, which itself is built of the class Track. So I try to create a branch like this Int_t bufsize = 64000; Int_t split = 1; event = new Event(); TTree *tree = new TTree("T","Example of a tree of TBranchClones"); TBranch *bTracks = tree->Branch("Tracks",event->fTracks,bufsize,split); But invoking this constructor does not create the desired branch bTracks, as can be recognized by looking at the address of bTracks which is 0. What am I doing wrong ? Could there be a little example and documentation on this method of creating a tree with several branches, when the branches should consist of TClonesArrays (method C) ? Thanks for the support !!! ******************************************************************************** Axel Schwank Hoffmann-von-Fallersleben-Strasse 15 DESY H1-F22 21029 Hamburg Notkestrasse 85 Tel (+49 40) 7219895 22607 Hamburg Rm. 1b / 269 Tel (+49 40) 8998-3560 Fax (+49 40) 8998-4385 e-mail schwank@mail.desy.de Quix 0165-6-2705109 ********************************************************************************
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