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Nub Sieve: Difference between revisions
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In [[A Programming Language]], the ''forward set selector'' <math>\sigma/\mathbf{v}</math> is a special notation indicating the nub sieve of <math>\mathbf{v}</math>, so that unique elements are found with a [[Compress]]ion <math>(\sigma/\mathbf{v})/\mathbf{v}</math>. | In [[A Programming Language]], the ''forward set selector'' <math>\sigma/\mathbf{v}</math> is a special notation indicating the nub sieve of <math>\mathbf{v}</math>, so that unique elements are found with a [[Compress]]ion <math>(\sigma/\mathbf{v})/\mathbf{v}</math>. | ||
The function Nubsieve (<syntaxhighlight lang=apl inline>≠</syntaxhighlight>) first appeared in [[A Dictionary of APL]] in 1987, and was | The function Nubsieve (<syntaxhighlight lang=apl inline>≠</syntaxhighlight>) first appeared in [[A Dictionary of APL]] in 1987, and was added to [[SHARP APL]] in 1989.<ref>[[IPSA]]. [https://archive.org/details/sharp-apl-release-20.0-guide-for-apl-programmers "SHARP APL Release 20.0: Guide for APL Programmers"].</ref> It appears in [[J]] as <syntaxhighlight lang=j inline>~:</syntaxhighlight> or Nub Sieve. It is also included in [[Dyalog APL 18.0]], released June 2020. | ||
== External links == | == External links == | ||
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* [https://mlochbaum.github.io/BQN/doc/selfcmp.html#mark-firsts BQN] (as <code>∊</code>) | * [https://mlochbaum.github.io/BQN/doc/selfcmp.html#mark-firsts BQN] (as <code>∊</code>) | ||
== References == | |||
<references/> | |||
{{APL built-ins}}[[Category:Primitive functions]][[Category:Set functions]] | {{APL built-ins}}[[Category:Primitive functions]][[Category:Set functions]] | ||