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Close composition: Difference between revisions
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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]] || < | | [[Atop (operator)|Atop]] || <syntaxhighlight lang=apl inline>⍥</syntaxhighlight> || <syntaxhighlight lang=j inline>@</syntaxhighlight> || <syntaxhighlight lang=j inline>@:</syntaxhighlight> || <syntaxhighlight lang=apl inline>⍤</syntaxhighlight> | ||
|- | |- | ||
| [[Over]] || < | | [[Over]] || <syntaxhighlight lang=apl inline>⍤</syntaxhighlight> || <syntaxhighlight lang=j inline>&</syntaxhighlight> || <syntaxhighlight lang=j inline>&:</syntaxhighlight> || <syntaxhighlight lang=apl inline>⍥</syntaxhighlight> | ||
|- | |- | ||
| [[Under]] || < | | [[Under]] || <syntaxhighlight lang=apl inline>¨</syntaxhighlight> || <syntaxhighlight lang=j inline>&.</syntaxhighlight> || <syntaxhighlight lang=j inline>&.:</syntaxhighlight> || <syntaxhighlight lang=apl inline>⍢</syntaxhighlight> | ||
|} | |} | ||
{{APL | {{APL features}}[[Category:Composition operators]] | ||