"John Kerenyi" <jo...@moval.org> writes:

>   File
> "/soft/python/lib/python2.6/site-packages/matplotlib/backends/backend_pd
> f.py", line 44, in <module>
>     from matplotlib import ttconv
> ImportError:
> /soft/python/lib/python2.6/site-packages/matplotlib/ttconv.so: undefined
> symbol: _ZTVSt19basic_ostringstreamIcSt11char_traitsIcESaIcEE

Sounds like a mismatch between C++ libraries on the system where
matplotlib was built and where it is being used. You mentioned a
cluster; perhaps your sysadmin compiled matplotlib on a special node
that has more libraries installed than the computation nodes. I don't
know how to fix this, but as a first step you could try compiling
matplotlib on a computation node (submit something like "python setup.py
build" as a job the same way you would submit another task on the
cluster) and seeing if that gives more clues about what is missing.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks


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