Headless plotting?

[sfeister]

Headless plotting is not implemented; currently requires X11 forwarding if running on a server.

Traceback

 (most recent call last):
  File "prorad.py", line 734, in <module>
    main()
  File "prorad.py", line 78, in main
    plot_results(grid, film_x, film_y, Ep, traces, plot_fluence=True, plot_traces=True, plot_quiver=False, save_images=True)
  File "prorad.py", line 665, in plot_results
    fig = plt.figure(2,figsize=(8,8))
  File "/software/python-2.7.12-el7-x86_64/lib/python2.7/site-packages/matplotlib/pyplot.py", line 535, in figure
    **kwargs)
  File "/software/python-2.7.12-el7-x86_64/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 81, in new_figure_manager
    return new_figure_manager_given_figure(num, figure)
  File "/software/python-2.7.12-el7-x86_64/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py", line 89, in new_figure_manager_given_figure
    window = Tk.Tk()
  File "/software/python-2.7.12-el7-x86_64/lib/python2.7/lib-tk/Tkinter.py", line 1815, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display "localhost:16.0"

This could be corrected using the matplotlib 'Agg' plotter, which would also suppress GUI popups. I'll see about pushing a change.

[sfeister]

I confirmed that this issue can be fixed by editing the prorad.py header:

Before (X11 required):

...
import matplotlib.pyplot as plt
...

After (headless plotting):

...
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
...

[deuterium33]

One way of having this detected automatically (in Unix platforms at least) is to do :

import matplotlib as mpl
import os
if not os.environ.has_key('DISPLAY'):
    mpl.use('Agg')
import matplotlib.pyplot as plt

Best,
Mathieu