Enlist: Difference between revisions
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{{Built-in|Enlist|∊}} is a [[primitive function]] which returns a [[simple]] [[vector]] of all simple [[scalar]] values in a possibly [[nested array]]. Enlist differs from [[Ravel]] in that Enlist flattens over all layers of nesting, while Ravel flattens only the outermost layer. Enlist shares its [[glyph]] <source lang=apl inline>∊</ | {{Built-in|Enlist|∊}} is a [[primitive function]] which returns a [[simple]] [[vector]] of all simple [[scalar]] values in a possibly [[nested array]]. Enlist differs from [[Ravel]] in that Enlist flattens over all layers of nesting, while Ravel flattens only the outermost layer. Enlist shares its [[glyph]] <source lang=apl inline>∊</syntaxhighlight> with the dyadic function [[Membership]]. | ||
== Examples == | == Examples == | ||
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∊M | ∊M | ||
1 2 3 4 5 6 7 8 | 1 2 3 4 5 6 7 8 | ||
</ | </syntaxhighlight> | ||
Enlist acts like [[Ravel]] for simple arrays. This includes simple scalars, where the result is a [[singleton]] vector. | Enlist acts like [[Ravel]] for simple arrays. This includes simple scalars, where the result is a [[singleton]] vector. | ||
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⍴∊3 ⍝ It's now a vector | ⍴∊3 ⍝ It's now a vector | ||
1 | 1 | ||
</ | </syntaxhighlight> | ||
== External links == | == External links == | ||
Revision as of 21:51, 10 September 2022
∊
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Enlist (∊) is a primitive function which returns a simple vector of all simple scalar values in a possibly nested array. Enlist differs from Ravel in that Enlist flattens over all layers of nesting, while Ravel flattens only the outermost layer. Enlist shares its glyph <source lang=apl inline>∊</syntaxhighlight> with the dyadic function Membership.
Examples
Enlist is equivalent to a depth-first search collecting all simple scalars, where each layer (which in turn can be of any rank) is traversed in ravel order.
<source lang=apl>
⎕←MAT←2 2⍴'MISS' 'IS' 'SIP' 'PI'
┌────┬──┐ │MISS│IS│ ├────┼──┤ │SIP │PI│ └────┴──┘
∊MAT
MISSISSIPPI
⎕←M←1 (2 2⍴2 3 4 5) (6(7 8))
┌─┬───┬───────┐ │1│2 3│┌─┬───┐│ │ │4 5││6│7 8││ │ │ │└─┴───┘│ └─┴───┴───────┘
∊M
1 2 3 4 5 6 7 8 </syntaxhighlight>
Enlist acts like Ravel for simple arrays. This includes simple scalars, where the result is a singleton vector.
<source lang=apl>
⎕←mat←4 4⍴⍳16 1 2 3 4 5 6 7 8 9 10 11 12
13 14 15 16
(,mat)≡∊mat
1
∊3
3
3 ≡ ∊3 ⍝ Not the same
0
⍴∊3 ⍝ It's now a vector
1 </syntaxhighlight>
External links
Lessons
Documentation