You can use the "Agg" or "PDF" backends to run matplotlib without
display support:
import matplotlib
matplotlib.use("PDF")
Cheers,
Mike
John Kerenyi wrote:
> 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:[email protected]]
> Sent: Wednesday, July 22, 2009 9:38 AM
> To: [email protected]
> Subject: Re: [Matplotlib-users] PDF backend errors out; PNG works fine
>
> "John Kerenyi" <[email protected]> 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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>
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--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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