_ROOT Version: 6.10.04-x86_64-slc6-gcc62-opt _Platform: CentOS7, SL6 (same behavior on both) _Compiler: pyROOT macro (with python 2.7.13-x86_64-slc6-gcc62) Dear experts, I realised I am using a TChain in what may be a quite special case so I would like to check with you the expected behavior: m…

Maybe @pcanal can give some advice for this particular case

I would guess that the difference in behavior is trigger by whether the branch is in the main tree or in the friend tree in the first file (i.e. the recorded name might be “myfriendtreename.mybranch” rather than “mybranch”.

But in this case I would expect to have a reproducible behavior, right? This is not what I observe and I cannot find any logic in it: It depends how I create the TChain (AddFile or create one TChain per file and then use TChain::Add to combine them), if I remove and recreate the same TChain the beh…

If you can provide a reproducer, I will take a closer look at the cause. Thanks.

Thank you for the reply and offering to have a look at this. To transpose my setup to lxplus is not so trivial because my tree knows the absolute path of its friend. Do you have acces to the NAF facility by any chance? Best wishes

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Behavior of TChain when adding Trees which have friends already defined

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