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 ------------------------------------------------------------------------------ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users ------------------------------------------------------------------------------ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users