Hi Jayoung, A branch of a TTree can in principle be any TObject. But it must be an object in memory. If your ntuple fits in memory, a TTree branch may be a pointer to this TTree (use non-split mode). I do not understand the problem you want to solve with this idea. Rene Brun Jayoung Wu wrote: > > Hi Rooters, > > Can a branch of a tree be a ntuple? > > For example, > TTree *tree = new TTree("EVENT","Event Tree"); > TNtuple *header = new TNtuple("header","EVENT HEADER","evtno:time:type); > > How can I define header as a Branch? > TBranch *branch1 = tree->Branch("Header",...); > > --- > Thanks a lot ! > Jayoung
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