Commute: Difference between revisions

Commute (view source)

445 bytes added , 15:04, 26 April 2020

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-{{Built-in|Commute|⍨}} is a [[Primitive function|primitive]] [[monadic]] [[operator]] that takes a [[function]] on its left and returns a new function with swapped arguments.
+{{Built-in|Commute|⍨}} is a [[monadic operator]] that takes a [[[dyadic function]] as operand and modifies how the argument(s) of its derived functions are used. If the derived function is used monadically, the argument is also used as left argument. This usage is also known as '''Self''' or, more informally, '''Selfie'''. If the derived function is used dyadically, the arguments are swapped. This usage is also known as '''Swap'''.
 == Examples ==
-Subtract one from every item of the input array.
+This decrements from the vector:
 <source lang=apl>
 -⍨ 1 2 3
+1 2
 </source>
+{{Works in|[[Dyalog APL]], [[dzaima/APL]], [[NARS2000]]}}
+Double:
+<source lang=apl>
+      +⍨1 2 3
+4 6
+</source>
+{{Works in|[[Dyalog APL]], [[dzaima/APL]], [[NARS2000]]}}
 == External links ==
@@ Line 12: / Line 20: @@
 === Lessons ===
-* [https://chat.stackexchange.com/transcript/52405?m=40900200#40900200 APL Cultivation]
+* [https://chat.stackexchange.com/rooms/52405/conversation/lesson-3-some-apl-operators-----#40900200]
 === Documentation ===