[Numpy-discussion] ndarray.T2 for 2D transpose

[josef.pktd at gmail.com]

On Thu, Apr 7, 2016 at 4:07 PM, Ian Henriksen <
insertinterestingnamehere at gmail.com> wrote:

> On Thu, Apr 7, 2016 at 1:53 PM <josef.pktd at gmail.com> wrote:
>
>> On Thu, Apr 7, 2016 at 3:26 PM, Ian Henriksen <
>> insertinterestingnamehere at gmail.com> wrote:
>>
>>> On Thu, Apr 7, 2016 at 12:31 PM <josef.pktd at gmail.com> wrote:
>>>
>>>> write unit tests with non square 2d arrays and the exception / test
>>>> error shows up fast.
>>>>
>>>> Josef
>>>>
>>>>
>>> Absolutely, but good programming practices don't totally obviate helpful
>>> error
>>> messages.
>>>
>>
>> The current behavior is perfectly well defined, and I don't want a lot of
>> warnings showing up because .T works suddenly only for ndim != 1.
>> I make lots of mistakes during programming. But shape mismatch are
>> usually very fast to catch.
>>
>> If you want safe programming, then force everyone to use only 2-D like in
>> matlab. It would have prevented me from making many mistakes.
>>
>> >>> np.array(1).T
>> array(1)
>>
>> another noop. Why doesn't it convert it to 2d?
>>
>> Josef
>>
>>
> I think we've misunderstood each other. Sorry if I was unclear. As I've
> understood the discussion thus far, "raising an error" refers to raising
> an error when
> a 1D array is passed used with the syntax a.T2 (for swapping the last two
> dimensions?). As far as whether or not a.T should raise an error for 1D
> arrays, that
> ship has definitely already sailed. I'm making the case that there's value
> in having
> an abbreviated syntax that helps prevent errors from accidentally using a
> 1D array,
> not that we should change the existing semantics.
>

Sorry, I misunderstood.

I'm not sure which case CHB initially meant.

Josef



>
> Cheers,
>
> -Ian
>
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