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Nub Sieve: Difference between revisions
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Updated: Dyalog 18.0 will be released → was released June 2020
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m (Updated: Dyalog 18.0 will be released → was released June 2020) |
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Nub Sieve can be used to filter a [[matrix]] by some of its columns, or find its unique rows. | Nub Sieve can be used to filter a [[matrix]] by some of its columns, or find its unique rows. | ||
<source lang=apl> | <source lang=apl> | ||
⎕← a ← (⍳6) ∘.! 3+⍳3 | |||
4 5 6 | 4 5 6 | ||
6 10 15 | 6 10 15 | ||
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:''See also [[Unique#History]].'' | :''See also [[Unique#History]].'' | ||
Nubsieve (<source lang=apl inline>≠</source>) first appeared in [[A Dictionary of APL]] in 1987, and was eventually added to [[SHARP APL]]. It appears [https://code.jsoftware.com/wiki/Vocabulary/tildeco in J] as <source lang=j inline>~:</source> or Nub Sieve. It is also included in [[Dyalog APL 18.0]], | Nubsieve (<source lang=apl inline>≠</source>) first appeared in [[A Dictionary of APL]] in 1987, and was eventually added to [[SHARP APL]]. It appears [https://code.jsoftware.com/wiki/Vocabulary/tildeco in J] as <source lang=j inline>~:</source> or Nub Sieve. It is also included in [[Dyalog APL 18.0]], released June 2020. | ||
== External links == | == External links == | ||
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=== Documentation === | === Documentation === | ||
* [http://help.dyalog.com/18.0/#Language/Primitive%20Functions/Unique%20Mask.htm Dyalog] | |||
* J [https://www.jsoftware.com/help/dictionary/d222.htm Dictionary], [https://code.jsoftware.com/wiki/Vocabulary/tildeco NuVoc] (as <source lang=j inline>~:</source>) | * J [https://www.jsoftware.com/help/dictionary/d222.htm Dictionary], [https://code.jsoftware.com/wiki/Vocabulary/tildeco NuVoc] (as <source lang=j inline>~:</source>) | ||
{{APL built-ins}}[[Category:Primitive functions]][[Category:Set functions]] | {{APL built-ins}}[[Category:Primitive functions]][[Category:Set functions]] | ||