Difference between revisions of "Pair"

From APL Wiki
Jump to navigation Jump to search
(Created page with "{{Built-in|Pair|⍮}} is a primitive function equivalent to the dfn <source lang=apl inline>{⍺←,⊂ ⋄ ⍺ ⍵}</source> which aids in constructing nested arrays...")
 
 
Line 13: Line 13:
 
{{Works in|[[dzaima/APL]], [[Extended Dyalog APL]]}}
 
{{Works in|[[dzaima/APL]], [[Extended Dyalog APL]]}}
  
It can also be combined with [[Mix]] to increase rank rather than depth:
+
It can also be combined with [[Mix]] to increase [[rank]] rather than [[depth]]:
  
 
[https://tio.run/##SyzI0U2pSszMTfz//1Hf1EdtE8wUzBUsNLQftU181LvkUe86XU3j//8B Try it online!]
 
[https://tio.run/##SyzI0U2pSszMTfz//1Hf1EdtE8wUzBUsNLQftU181LvkUe86XU3j//8B Try it online!]

Latest revision as of 09:59, 12 February 2020

Pair () is a primitive function equivalent to the dfn {,⊂ } which aids in constructing nested arrays during tacit programming where stranding by juxtaposition is not available. It is also equivalent to , using the Over operator or ,⍨∘⍨∘ using only traditional operators. It was introduced in Extended Dyalog APL, and then adopted into dzaima/APL.

Common usage

Its plain usage is in pairing up two parallel values:

Try it online!

      6 7 8(+-)3
┌───────┬─────┐
9 10 113 4 5
└───────┴─────┘

It can also be combined with Mix to increase rank rather than depth:

Try it online!

      6 7 8(+↑-)3
9 10 11
3  4  5


APL built-ins [edit]
Primitive functions
Scalar
Monadic ConjugateNotRollType
Dyadic AddSubtractEqual to (Xnor) ∙ Not Equal to (Xor)
Non-Scalar
Structural ShapeReshapeTallyDepthRavelReverseRazeMixCut (K)Pair
Selection TakeDropUniqueIdentitySelect
Selector Interval Index
Computational MatchNot MatchNub SieveFormatExecute
Primitive operators EachReverse Compose
Quad names
Arrays Index originMigration level
Functions
Operators
Other ZildeHigh minusFunction axis