[Cython] buffer shape incompatible with memoryview shape

[Stefan Behnel]

Dag Sverre Seljebotn, 21.06.2012 14:05:
> On 06/21/2012 01:36 PM, Stefan Behnel wrote:
>>> On 06/21/2012 10:59 AM, Stefan Behnel wrote:
>>>> I find this worth fixing for 0.17:
>>>>
>>>> http://trac.cython.org/cython_trac/ticket/780
>>>
>> I ran into this when I gave a Cython+NumPy course and this was the first
>> thing that the attendants tried when I asked them to validate that two
>> input arrays have the same size before adding them. It's the one obvious
>> way to do it, and it fails miserably. I think it should be fixed, and I
>> think it should be fixed soon because it feels really low-level and
>> complicated, especially to new users.
> 
> Can you clarify a bit -- did you give this course using np.ndarray[double,
> ndim=2], or double[:, :]? They're really very separate under the hood and
> the fix is different.
> 
> Or, did you actually use object[double, ndim=2] like in the bug report?
> (Did me and Mark get around to propose deprecating this one on the list?)

IIRC, we used object[double, ndim=2] for both and I also tried it with a
memory view as in the bug report. I thought that using "object" was the
preferred way to do it? At least, it doesn't restrict the type of the
buffer exporter, which I consider a good thing.

Stefan