hi say i have a tree with these branches: TTree * t2 = new TTree("t2","raw correlations go here"); t2->Branch("reference",&j,"reference/I"); t2->Branch("target",&k,"target/I"); t2->Branch("bin",&s,"bin/I"); t2->Branch("value",&sum,"value/I"); and i fill it up like this: for (i=0;i<ntrials;i++) { ...... for(k=j;k<n_units;k++) { ....... for(s=-80;s<81;s++) { ......... do calculations to find "sum" t2->Fill(); } } } } the reference(j), the target(k), and the bin(s) repeat periodically. "sum" is always different. after the first repetition of the reference, the target, and the bin, i do not want to put them in the tree again. i only want to increment the original value of "sum" in the tree. can this be done? thank you very much, paymon i am using: WindowsXP/NT/w2000 with VC++ 7.0, version 3.10/01 (good old tar file) **WIN32GDK** thanks
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