Re: [matplotlib-devel] Axes.scatter call fails since removal of PyCXX

[Joel B. M. <jo...@ki...>]

On Mon, Nov 17, 2014 at 09:36:50AM -0500, Joel B. Mohler wrote:
> I think I see a breakage of the scatter call that I think should work and did
> work before
> https://github.com/matplotlib/matplotlib/commit/be34210a8c09fcd639ece583eb5c0acb855222b6
> 
> This is running on windows 7 (32 bit) with numpy 1.8 and current master.

Ugh, I tried this same example on my ubuntu box and it works.  I update this
diagnosis to "scatter is broken on windows since removing PyCXX"; note that I
do not get a traceback with the code below if I replace "scatter" with "plot".

Being that windows devs are scarce, I'll be digging into this more.  I
certainly welcome any clues as it seems very bizarre to me so far.

Joel

> 
> The example is:
> 
> ***
> import numpy
> from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
> from matplotlib.figure import Figure
> 
> POINTS = 500
> 
> figure = Figure(figsize=(6, 6), dpi=72)
> ax = figure.add_subplot(1, 1, 1, projection=None)
> scat = ax.scatter(numpy.arange(POINTS), numpy.sin(numpy.arange(POINTS)))
> ***
> 
> I get on current master
> 
> ***
> Traceback (most recent call last):
>   File "C:\work\mpl_scatter_example.py", line 9, in <module>
>     scat = ax.scatter(numpy.arange(POINTS), numpy.sin(numpy.arange(POINTS)))
>   File "C:\Python27\lib\site-packages\matplotlib\axes\_axes.py", line 3690, in scatter
>     self.add_collection(collection)
>   File "C:\Python27\lib\site-packages\matplotlib\axes\_base.py", line 1459, in add_collection
>     self.update_datalim(collection.get_datalim(self.transData))
>   File "C:\Python27\lib\site-packages\matplotlib\collections.py", line 198, in get_datalim
>     offsets, transOffset.frozen())
>   File "C:\Python27\lib\site-packages\matplotlib\path.py", line 977, in get_path_collection_extents
>     master_transform, paths, transforms, offsets,offset_transform))
> ValueError: object too deep for desired array
> ***
> 
> I did very little troubleshooting beyond confirming that this works before the
> merge mentioned in the first paragraph.
> 
> Joel