On Mon, Aug 27, 2018 at 1:46 PM, Charles R Harris <charlesr.harris@gmail.com> wrote:


On Mon, Aug 27, 2018 at 11:37 AM Robert Kern <robert.kern@gmail.com> wrote:
On Mon, Aug 27, 2018 at 10:30 AM Tyler Reddy <tyler.je.reddy@gmail.com> wrote:
Chuck suggested ( https://github.com/numpy/numpy/pull/11805#issuecomment-416069436 ) that we may want to consider deprecating np.ediff1d, which is perhaps not much more useful than np.diff, apart from having some arguably strange prepend / append behavior added in.


Thoughts?

Huh. Never knew this existed. I'd say about 50% of the time I use np.diff(), I'm doing that prepend/append behavior manually (and less readably, possibly inefficiently, but most importantly annoyingly).

same for me
never seen, never used

 

I was thinking we might want to add something to `np.diff`, maybe using `np.pad`.

ediff1d avoids one extra temp array compared to simple padding.

However, ediff1d pads the final, difference array instead of the original data array.

AFAIR, I almost always need padding of the original array.

eg as in the standard example of round tripping between cumsum and diff

Josef

 

Chuck 

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