[matplotlib-devel] plot([], [], drawstyle = 'steps') fails

[Gregor T. <gre...@gm...>]

Hi all,

sorry, only reporting, no bugfix. I just discovered that an empty plot 
with drawstyle 'steps', 'steps-pre', 'steps-mid' and 'steps-post' fails. 
I am using matplotlib 0.98.5.2.

Example

plot([], [], drawstyle = 'steps')

...
C:\Python25\lib\site-packages\matplotlib\lines.pyc in 
_draw_steps_pre(self, renderer, gc, path, trans)
    784     def _draw_steps_pre(self, renderer, gc, path, trans):
    785         vertices = self._xy
--> 786         steps = ma.zeros((2*len(vertices)-1, 2), np.float_)
    787
    788         steps[0::2, 0], steps[1::2, 0] = vertices[:, 0], 
vertices[:-1, 0
]
...

ValueError: negative dimensions are not allowed

Gregor