[Numpy-discussion] Performance feature for np.isin and np.in1d

Miles Cranmer miles.cranmer at gmail.com
Tue Oct 9 14:01:48 EDT 2018


I was wondering how I could have this PR merged (
https://github.com/numpy/numpy/pull/12065)? The discussion on the PR seems
to have gone well and all tests pass.


On Mon, Oct 1, 2018 at 2:36 PM Miles Cranmer <miles.cranmer at gmail.com>

> (Not sure what the right list is for this)
> Hi,
> I have started a PR for a "fast_integers" flag for np.isin and np.in1d
> which greatly increases performance when both arrays are integral. It works
> by creating a boolean array with elements set to 1 where the parent array
> (ar2) has elements and 0 otherwise. This array is then indexed by the child
> array (ar1) to create the output.
> https://github.com/numpy/numpy/pull/12065
> Thoughts on this? Please let me know if you have any questions about my
> addition.
> Thank you.
> Best regards,
> Miles
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