TTree symbol lost in interactive session

[heather1]

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_ROOT Version: 6.14.04
_Platform: macOS High Sierra
Compiler: Not Provided

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Hi,
I’m having a problem since moving to ROOT6 from 5.34 with interactive sessions access a TTree in files. I can access my TTree fine when just accessing simple variables in branches, but once I use a function in my TTree (which executes fine), subsequent commands to Draw from the tree return this error (‘teb’ is the TTree in my files):

IncrementalExecutor::executeFunction: symbol ‘teb’ unresolved while linking [cling interface function]!

I never had any problems with the same code in v5.34, and if I access functions in macros, the tree remains accessible afterwards. I’d appreciate any help!!

Thanks, Heather

[Wile_E_Coyote]

You need to show what you actually do (how you open the root file, retrieve the tree and then some commands which work and some which don’t).

[heather1]

Sorry, here is an example of what I do:

$ root -l

Loaded: libGRETINA.dylib, and libS800.dylib

root [0] TFile *f = new TFile("~/gretina-unpack/SimulationMod.root")

(TFile *) 0x7fd879407ca0

root [1] teb->Draw( "g2.cc" )

Info in <TCanvas::MakeDefCanvas>: created default TCanvas with name c1

root [2] teb->Draw("g2.xtals.maxIntPtX()")

root [3] teb->Draw ("g2.cc" )

IncrementalExecutor::executeFunction: symbol 'teb' unresolved while linking [cling interface function]!

Lines [1] and [2] generated the expected histrograms, no problem. But as soon as I call any function in the tree (as in [2], all subsequent commands show the error.

Thanks!

[Wile_E_Coyote]

Try:

TFile *f = TFile::Open("~/gretina-unpack/SimulationMod.root");
TTree *teb; f->GetObject("teb", teb);
// teb->Draw(...)

[heather1]

Thank you! That works. Though I’m not sure I understand exactly why I’m getting the behavior I see, and only with ROOT6. But this works.

Thank you!