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{{Built-in|Pick|⊃}} is a [[dyadic]] [[primitive function]] which performs deep [[indexing]] on a possibly [[nested array]]. Pick allows to extract a value through multiple layers of nesting in a single function application. Pick | {{Built-in|Pick|⊃}} is a [[dyadic]] [[primitive function]] which performs deep [[indexing]] on a possibly [[nested array]]. Pick allows to extract a value through multiple layers of nesting in a single function application. Pick uses the [[Right Shoe]] glyph. | ||
== Examples == | == Examples == | ||
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<source lang=apl> | <source lang=apl> | ||
⎕←G←2 3⍴('ABC' 1)('DEF' 2)('GHI' 3)('JKL' 4)('MNO' 5)('PQR' 6) | |||
┌───────┬───────┬───────┐ | ┌───────┬───────┬───────┐ | ||
│┌───┬─┐│┌───┬─┐│┌───┬─┐│ | │┌───┬─┐│┌───┬─┐│┌───┬─┐│ | ||
Line 25: | Line 25: | ||
K | K | ||
</source> | </source> | ||
== See also == | |||
* [[Index (function)]] | |||
* [[Bracket indexing]] | |||
* [[Select]] | |||
== External links == | == External links == | ||
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=== Documentation === | === Documentation === | ||
* [ | * [https://help.dyalog.com/latest/#Language/Primitive%20Functions/Pick.htm Dyalog] | ||
* [http://microapl.com/apl_help/ch_020_020_610.htm APLX] | * [http://microapl.com/apl_help/ch_020_020_610.htm APLX] | ||
{{APL built-ins}}[[Category:Primitive functions]] | {{APL built-ins}}[[Category:Primitive functions]] |
Revision as of 14:33, 14 July 2020
⊃
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Pick (⊃
) is a dyadic primitive function which performs deep indexing on a possibly nested array. Pick allows to extract a value through multiple layers of nesting in a single function application. Pick uses the Right Shoe glyph.
Examples
The left argument X must be a vector where each element of X specifies the multi-dimensional index at each layer of the right argument Y. The result of X⊃Y
is the item of Y at the location specified by X.
⎕←G←2 3⍴('ABC' 1)('DEF' 2)('GHI' 3)('JKL' 4)('MNO' 5)('PQR' 6) ┌───────┬───────┬───────┐ │┌───┬─┐│┌───┬─┐│┌───┬─┐│ ││ABC│1│││DEF│2│││GHI│3││ │└───┴─┘│└───┴─┘│└───┴─┘│ ├───────┼───────┼───────┤ │┌───┬─┐│┌───┬─┐│┌───┬─┐│ ││JKL│4│││MNO│5│││PQR│6││ │└───┴─┘│└───┴─┘│└───┴─┘│ └───────┴───────┴───────┘ (⊂2 1)⊃G ┌───┬─┐ │JKL│4│ └───┴─┘ ((2 1)1)⊃G JKL ((2 1)1 2)⊃G K
See also
External links
Documentation