[gpaw-users] Plotting error

[Varadharajan Srinivasan]

Dear all,

I was trying out a tutorial calculation on WS2 band structure with
spin-orbit coupling. I modified the system to MoS2 and tried out the python
scripts given in the tutorial. At the plotting stage I get the following
error :

 plt.savefig('MoS2_bands.png')

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/site-packages/matplotlib/pyplot.py", line
688, in savefig
    res = fig.savefig(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/figure.py", line
1565, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib/backend_bases.py", line
2232, in print_figure
    **kwargs)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py",
line 527, in print_png
    FigureCanvasAgg.draw(self)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib/backends/backend_agg.py",
line 474, in draw
    self.figure.draw(self.renderer)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/artist.py", line
61, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/figure.py", line
1159, in draw
    func(*args)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/artist.py", line
61, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/axes/_base.py",
line 2324, in draw
    a.draw(renderer)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/artist.py", line
61, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/lines.py", line
739, in draw
    ln_color_rgba = self._get_rgba_ln_color()
  File "/usr/local/lib/python2.7/site-packages/matplotlib/lines.py", line
1251, in _get_rgba_ln_color
    return colorConverter.to_rgba(self._color, self._alpha)
  File "/usr/local/lib/python2.7/site-packages/matplotlib/colors.py", line
376, in to_rgba
    'to_rgba: Invalid rgba arg "%s"\n%s' % (str(arg), exc))
ValueError: to_rgba: Invalid rgba arg "0.5"
to_rgb: Invalid rgb arg "0.5"
cannot convert argument to rgb sequence


Have I missed installing some libraries? I am working on a brew-based
installation of ase and gpaw on El Capitan Mac OS X.

Thanks,
Vardha.
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