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Graphical objects do not appear

No graphical objects have appeared after their creation, for instance, TBrowser, TCanvas etc:

import ROOT
b = ROOT.TBrowser()
c = ROOT.TCanvas()

Such behaviour does not take place in the previous ROOT versions, in particular, in version 6.14.04 it works fine.

ROOT Version: 6.22/02
Platform: CentOS Linux release 7.8.2003 (lxplus)
Compiler: GCC 4.8.5
Python: 2.7.5

Hi @kot,
does running the code with python -i (note the -i) solve the issue?
What if you run those lines in the interactive interpreter rather than in a script? Also if you are on lxplus did you connect with ssh -XY to get X11 forwarding? Are there warnings or errors printed on screen?

Cheers,
Enrico

Dear Enrico,

Thank you very much for the prompt response.

Python is run in an interactive mode, not as a script.
I connect to lxplus via MobaXterm with enabled X11-forwarding. Please note it works fine with ROOT 6.14.04.
No warnings, either errors are thrown

The reason is probably that ROOT is running in batch mode (ROOT.gROOT.IsBatch() probably returns True).

I get the same result when using 6.14/08 from the LCG releases (source /cvmfs/sft.cern.ch/lcg/views/LCG_94a/x86_64-centos7-gcc8-dbg/setup.sh).

What is a working setup on current lxplus?

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Dear Enrico,

Yes, you are right,
ROOT.gROOT.IsBatch() returns True

Dear Enrico,

Setting Batch to False resolves issue: ROOT.gROOT.SetBatch(False).
Thank you very much!

Best regards,
Alex

1 Like

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