Hi Christian, As I am not sure to understand your question (or what you want to do), I can only give a naive answer fTree = (TTree*)gDirectory->Get("Tree1"); fTree->AddFriend("Tree2", "file2.root"); fTree->AddFriend("Tree3", "file3.root"); fTree->AddFriend("Tree4", "file4.root"); aTree = (TTree*)gDirectory->Get("TreeA"); aTree->AddFriend("TreeB", "fileB.root"); aTree->AddFriend("TreeC", "fileC.root"); Rene Brun cstrato wrote: > > Dear Rooters > > Suppose that I have a tree with following friends: > fTree = (TTree*)gDirectory->Get("Tree1"); > fTree->AddFriend("Tree2", "file2.root"); > fTree->AddFriend("Tree3", "file3.root"); > fTree->AddFriend("TreeA", "fileA.root"); > fTree->AddFriend("Tree4", "file4.root"); > fTree->AddFriend("TreeB", "fileB.root"); > fTree->AddFriend("TreeC", "fileC.root"); > > How can I separate fTree into the following two treefriends: > 1, fTree("Tree1") with friends Tree2, Tree3, Tree4 > 2, aTree("TreeA") with friends TreeB, TreeC > > Thank you in advance for your help. > > Best regards > Christian > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- > C.h.r.i.s.t.i.a.n. .S.t.r.a.t.o.w.a > V.i.e.n.n.a. .A.u.s.t.r.i.a > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
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