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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]] < | {{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]] <syntaxhighlight lang=apl inline>∊</syntaxhighlight> with the dyadic function [[Membership]]. | ||
== Examples == | == Examples == | ||
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Enlist is equivalent to a [[wikipedia:depth-first search|depth-first search]] collecting all simple scalars, where each layer (which in turn can be of any rank) is traversed in [[ravel order]]. | Enlist is equivalent to a [[wikipedia:depth-first search|depth-first search]] collecting all simple scalars, where each layer (which in turn can be of any rank) is traversed in [[ravel order]]. | ||
< | <syntaxhighlight lang=apl> | ||
⎕←MAT←2 2⍴'MISS' 'IS' 'SIP' 'PI' | ⎕←MAT←2 2⍴'MISS' 'IS' 'SIP' 'PI' | ||
┌────┬──┐ | ┌────┬──┐ | ||
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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. | ||
< | <syntaxhighlight lang=apl> | ||
⎕←mat←4 4⍴⍳16 | ⎕←mat←4 4⍴⍳16 | ||
1 2 3 4 | 1 2 3 4 | ||