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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