Dear Philippe Thank you, I will try to implement your suggestion. Best regards Christian Philippe Canal wrote: > 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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