[Numpy-discussion] Deprecating matrices.

[Todd]

On Jan 6, 2017 20:28, "Ralf Gommers" <ralf.gommers at gmail.com> wrote:



On Sat, Jan 7, 2017 at 2:21 PM, CJ Carey <perimosocordiae at gmail.com> wrote:

>
> On Fri, Jan 6, 2017 at 6:19 PM, Ralf Gommers <ralf.gommers at gmail.com>
> wrote:
>
>> This sounds like a reasonable idea. Timeline could be something like:
>>
>> 1. Now: create new package, deprecate np.matrix in docs.
>> 2. In say 1.5 years: start issuing visible deprecation warnings in numpy
>> 3. After 2020: remove matrix from numpy.
>>
>> Ralf
>>
>
> I think this sounds reasonable, and reminds me of the deliberate
> deprecation process taken for scipy.weave. I guess we'll see how successful
> it was when 0.19 is released.
>
> The major problem I have with removing numpy matrices is the effect on
> scipy.sparse, which mostly-consistently mimics numpy.matrix semantics and
> often produces numpy.matrix results when densifying. The two are coupled
> tightly enough that if numpy matrices go away, all of the existing sparse
> matrix classes will have to go at the same time.
>
> I don't think that would be the end of the world,
>

Not the end of the world literally, but the impact would be pretty major. I
think we're stuck with scipy.sparse, and may at some point will add a new
sparse *array* implementation next to it. For scipy we will have to add a
dependency on the new npmatrix package or vendor it.

Ralf



> but it's definitely something that should happen while scipy is still
> pre-1.0, if it's ever going to happen.
>
> _______________________________________________
> NumPy-Discussion mailing list
> NumPy-Discussion at scipy.org
> https://mail.scipy.org/mailman/listinfo/numpy-discussion
>
>

_______________________________________________
NumPy-Discussion mailing list
NumPy-Discussion at scipy.org
https://mail.scipy.org/mailman/listinfo/numpy-discussion


So what about this:

1. Create a sparse array class
2. (optional) Refactor the sparse matrix class to be based on the sparse
array class (may not be feasible)
3. Copy the spare matrix class into the matrix package
4. Deprecate the scipy sparse matrix class
5. Remove the scipy sparse matrix class when the numpy matrix class

I don't know about the timeline, but this would just need to be done by
2020.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/numpy-discussion/attachments/20170107/b50a531b/attachment.html>