[Matplotlib-users] Bug in Custom Dash List

[Jeffrey S. <jef...@gm...>]

I have old scripts I had made that I was rerunning in newer versions of
matplotlib. They now fail because the function requires dashes to be
greater than 0. I have them set to zero as below and it still throws the
error. I had to set the zero in the middle to 1e-12 to get around this but
is this the desired behavior? I don't see why 0 can't be an acceptable
input to the dash function. This is on matplotlib 1.3.0rc2.

Example code:
dashes = [(1.5,1.5,3,1.5),(1,0),(1,1.2)]
legendLabels.append(ax.plot(x,y[i], color=plotColor[i%8],
dashes=dashes[i%3])[0])

End of error:
/home/bigtyme/.virtualenvs/ipl/local/lib/python2.7/site-packages/matplotlib-1.3.0rc2-py2.7-linux-x86_64.egg/matplotlib/lines.pyc
in _draw_lines(self, renderer, gc, path, trans)
    936
    937     def _draw_lines(self, renderer, gc, path, trans):
--> 938         self._lineFunc(renderer, gc, path, trans)
    939
    940     def _draw_steps_pre(self, renderer, gc, path, trans):

/home/bigtyme/.virtualenvs/ipl/local/lib/python2.7/site-packages/matplotlib-1.3.0rc2-py2.7-linux-x86_64.egg/matplotlib/lines.pyc
in _draw_dashed(self, renderer, gc, path, trans)
    981         gc.set_linestyle('dashed')
    982         if self._dashSeq is not None:
--> 983             gc.set_dashes(0, self._dashSeq)
    984
    985         renderer.draw_path(gc, path, trans)

/home/bigtyme/.virtualenvs/ipl/local/lib/python2.7/site-packages/matplotlib-1.3.0rc2-py2.7-linux-x86_64.egg/matplotlib/backend_bases.pyc
in set_dashes(self, dash_offset, dash_list)
    902             dl = np.asarray(dash_list)
    903             if np.any(dl <= 0.0):
--> 904                 raise ValueError("All values in the dash list must
be positive")
    905         self._dashes = dash_offset, dash_list
    906

ValueError: All values in the dash list must be positive

Cheers,
Jeff