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

Miles Cranmer miles.cranmer at gmail.com
Mon Oct 1 14:36:14 EDT 2018

(Not sure what the right list is for this)


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.


Thoughts on this? Please let me know if you have any questions about my

Thank you.
Best regards,
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