Hi Christian, The TTree object has one list of friend and it always uses all the friends on the list. However you can manipulate the list as you see fit after getting it from TTree::GetListOfFriends. For example you could extract (Remove) from it, TreeA, TreeB, TreeC etc ... and add them to the list of friends of TTreeA. Cheers, Philippe. -----Original Message----- From: owner-roottalk@pcroot.cern.ch [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of cstrato Sent: Tuesday, April 13, 2004 1:00 PM To: Rene Brun Cc: roottalk@pcroot.cern.ch Subject: Re: [ROOT] How to separate tree friends Dear Rene Thank you, but this is not what I want: I have a method: myclass-AddTrees("treename", "filename", "group") where the user can add trees from different root files. These trees are stored as friends to the first tree fTree. fTree is then passed to different methods, where I would like to separate these trees based on their "groups", and create e.g. two trees with friends for: "group1": fTree("Tree1") with friends Tree2, Tree3, Tree4 "group2": atree("TreeA") with friends TreeB, TreeC (These separate tree groups are then again passed to different methods.) Best regards Christian Rene Brun wrote: > 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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