Hi, I'm trying to create arbitrary numbers of TClonesArrays, one for each name in a file. So, my solution looks something like: Char stk[80]; vector<TClonesArray*> vh1; vector<MyObj*> com; vector<TBranch*> b; Int_t count=0; while (1) { in >> stk; if (!in.good()) break; vh1.push_back( new TClonesArray("TradeEvent",10) ); com.push_back( new MyObj() ); (com[count])->set_theArray(vh1[count]); b.push_back( tree->Branch( "this", "that", &(com[count]), bufsize, 2) ); ...etc. count++ } So I'm using "new" to just feed my vectors as many times as I have names in the file. It occured to me that doing things this way might confuse root even though it works within the scope of my file. Could you please either reassure me that this should be OK with root or let me know that this is probably not the right way. Specifically, my code chokes at tree->Fill() in a place where it is working with the TClonesArray. If the above looks fine, I have another problem somewhere. - John
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