TreeChain SetAlias and AddFriend branches

[Daniel Böckenhoff]

Hi everyone!

After I opened a tree from a file with a TreeChain (t = TreeChain("t",filePath)) , I want to set an alias.

It returns True

        >>> t.SetAlias("chiliX","distP + distD")
        True

but i get an ROOTError when drawing:

        loc='TTreeFormula::Compile', msg=' Bad numerical expression : "chiliX"

and also Branches added with

        t.AddFriend("tP",filePathPromptFriend)

are not known when drawing.

Could someone comment? I am very excited about finding everything I ever dreamed of in rootpy, so I hope to make this work.

Cheers,

Daniel

[Noel Dawe]

Hi Daniel,

Catching up on email after vacation. Sorry for the lack of response earlier.

At this time, TreeChain is really only intended to replace TChain in the context of looping on an entry-by-entry basis. Simple Draw()s are also fine, but SetAlias and AddFriend will not work as intended since __getattr__ is really delegating those method requests to the currently active (first) tree in the chain.

Sorry about that. For now, I'd suggest sticking with TChain for anything involving aliases or friends.

Best,

Noel

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