Thank you for your response. Your response made me wonder how the script would
operate in a non-graphic environment--I had tested it on a login node but not
on a computing node. It appears that even though I have no need for any graphic
display, the modules I am loading expect to have it nonetheless. I invoke
matplotlib using the standard "import matplotlib.pyplot as plt" line. Here is
the output when run on a compute node:
-------------------------
[ac.jkere...@n123 pygraph]$ ./run_pygraph.py png
Creating Top 100 V/C ratios graph...
Traceback (most recent call last):
File "./run_pygraph.py", line 566, in <module>
GraphTop100VC (Top100VCFilename)
File "./run_pygraph.py", line 326, in GraphTop100VC
fig=plt.figure()
File "/soft/python/lib/python2.6/site-packages/matplotlib/pyplot.py", line
251, in figure
**kwargs)
File
"/soft/python/lib/python2.6/site-packages/matplotlib/backends/backend_tkagg.py",
line 90, in new_figure_manager
window = Tk.Tk()
File "/soft/python/lib/python2.6/lib-tk/Tkinter.py", line 1643, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive,
wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable
---------------------
Can anyone advise if there another way to invoke matplotlib that does not
require graphic support?
With respect to your suggestion that I run python setup.py build, I don't seem
to have the necessary permissions but the sysadmin is very helpful and once I
have a little more information on the new problem I'll get his help again.
Thanks again,
John Kerenyi
-----Original Message-----
From: Jouni K. Seppänen [mailto:j...@iki.fi]
Sent: Wednesday, July 22, 2009 9:38 AM
To: matplotlib-users@lists.sourceforge.net
Subject: Re: [Matplotlib-users] PDF backend errors out; PNG works fine
"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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