Hi, make a 2-d or 3-d array. Create one single branch with this array. Fill the array in your nested loop, then fill the tree. Rene Brun payman hosseini wrote: > > 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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