[Numpy-discussion] Deprecating matrices.

[CJ Carey]

> Decoupled or not, sparse still needs to be dealt with. What is the plan?
>

My view would be:
- keep current sparse matrices as is (with improvements, like
__numpy_func__ and the various performance improvements that regularly get
done)
- once one of the sparse *array* implementations progresses far enough,
merge that and encourage people to switch over
- in the far future, once packages like scikit-learn have switched to the
new sparse arrays, the sparse matrices could potentially also be split off
as a separate package, in the same way as we did for weave and now can do
for npmatrix.


I think that's the best way forward as well. This can happen independently
of numpy matrix changes, and doesn't leave users with silently broken code.
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