How to filter a list in J?

Posted by Gregory Higley on Stack Overflow See other posts from Stack Overflow or by Gregory Higley
Published on 2010-05-19T10:55:36Z Indexed on 2010/05/19 11:00 UTC
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I'm currently learning the fascinating J programming language, but one thing I have not been able to figure out is how to filter a list.

Suppose I have the arbitrary list 3 2 2 7 7 2 9 and I want to remove the 2s but leave everything else unchanged, i.e., my result would be 3 7 7 9. How on earth do I do this?

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