[Numpy-discussion] Masking an array with another array

Neil Crighton neilcrighton@gmail....
Thu Apr 23 09:23:57 CDT 2009

 <josef.pktd <at> gmail.com> writes:

> setmember1d is very fast compared to the other solutions for large b.
> However, setmember1d requires that both arrays only have unique elements.
> So it doesn't work if, for example, your first array is a data vector
> with member ship in different groups (therefore not only uniques), and
> the second array is the sub group that you want to check.

Note there's a patch waiting to be reviewed that adds another version of
setmember_1d for non-unique inputs.



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