Close composition: Difference between revisions

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305 bytes added ,  08:06, 26 April 2022
add modern column and syntax colouring
(Created page with "In SHARP APL and J, a '''close composition''' is one of the operators Atop (operator), Over, or Under, defined so that the overall result has functi...")
 
(add modern column and syntax colouring)
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In [[SHARP APL]] and [[J]], a '''close composition''' is one of the [[operator]]s [[Atop (operator)|Atop]], [[Over]], or [[Under]], defined so that the overall result has [[function rank]] equal to the right operand. In SHARP all composition operators follow this pattern, while in J, both close and non-close forms (with a result rank of infinity, matching the definition in most APLs) are provided.
In [[SHARP APL]] and [[J]], a '''close composition''' is one of the [[operator]]s [[Atop (operator)|Atop]], [[Over]], or [[Under]], defined so that the overall result has [[function rank]] equal to the right operand. In SHARP all composition operators follow this pattern, while in J, both close and non-close forms (with a result rank of infinity, matching the definition in most modern APLs) are provided.


{|class=wikitable
{|class=wikitable
! Operator !! SHARP !! J close !! J non-close
! Operator !! SHARP !! J close !! J non-close !! Modern
|-
|-
| [[Atop (operator)|Atop]] || <code>⍥</code> || <code>@</code>  || <code>@:</code>
| [[Atop (operator)|Atop]] || <source lang=apl inline>⍥</source> || <source lang=j inline>@</source>  || <source lang=j inline>@:</source> || <source lang=apl inline>⍤</source>
|-
|-
| [[Over]]                || <code>⍤</code> || <code>&</code>  || <code>&:</code>
| [[Over]]                || <source lang=apl inline>⍤</source> || <source lang=j inline>&</source>  || <source lang=j inline>&:</source> || <source lang=apl inline>⍥</source>
|-
|-
| [[Under]]                || <code>¨</code> || <code>&.</code> || <code>&.:</code>
| [[Under]]                || <source lang=apl inline>¨</source> || <source lang=j inline>&.</source> || <source lang=j inline>&.:</source> || <source lang=apl inline>⍢</source>
|}
|}


{{APL built-ins}}[[Category:Composition operators]]
{{APL built-ins}}[[Category:Composition operators]]

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