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Unique: Difference between revisions
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{{Built- | {{Built-ins|Unique|∪|↑}}, or '''Nub''', is a [[monadic]] [[set function]] which removes duplicate [[major cells]] from an array. It returns only the distinct cells (those which do not [[match]] an earlier distinct cell) in the order they appeared in the array. | ||
== Examples == | == Examples == | ||
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In some languages, such as [[J]] and [[Dyalog APL 17.0]] and later, Unique applies to the [[major cells]] of an array, including those with rank greater than 1: | In some languages, such as [[J]] and [[Dyalog APL 17.0]] and later, Unique applies to the [[major cells]] of an array, including those with rank greater than 1: | ||
<source lang=apl> | <source lang=apl> | ||
⎕←x ← (⍳10)∘.∨2 3 6 | |||
1 1 1 | 1 1 1 | ||
2 1 2 | 2 1 2 | ||
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⎕CT←1e¯14 | ⎕CT←1e¯14 | ||
⎕PP←18 ⍝ Print all digits | ⎕PP←18 ⍝ Print all digits | ||
⎕←x←1+⎕CT×0 0.6 1.2 | |||
1 1.000000000000006 1.000000000000012 | 1 1.000000000000006 1.000000000000012 | ||
⍳⍨x ⍝ Each element equal to the previous | ⍳⍨x ⍝ Each element equal to the previous | ||
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== References == | == References == | ||
<references /> | <references /> | ||
{{APL built-ins}}[[Category:Primitive functions]] | {{APL built-ins}}[[Category:Primitive functions]][[Category:Set functions]] | ||