Function rank: Difference between revisions
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== History == | == History == | ||
Function rank was first introduced without being given a name in [[SHARP APL]], as a feature of the compositions [[Over|with]] and [[Atop|over]]. New compositions such as <syntaxhighlight lang=apl inline>f⍤g</syntaxhighlight> were described as "close in the sense that the expression… is applied individually to each subarray argument of <syntaxhighlight lang=apl inline>g</syntaxhighlight>".<ref>K.E. Iverson. [https://www.jsoftware.com/papers/satn41.htm "Composition and Enclosure"]. SATN 41, 1981-06-20.</ref> The concept of function rank was formalized, and applied to most primitives, when the [[Rank operator]] was introduced | Function rank was first introduced without being given a name in [[SHARP APL]], as a feature of the compositions [[Over|with]] and [[Atop|over]]. New compositions such as <syntaxhighlight lang=apl inline>f⍤g</syntaxhighlight> were described as "close in the sense that the expression… is applied individually to each subarray argument of <syntaxhighlight lang=apl inline>g</syntaxhighlight>".<ref>K.E. Iverson. [https://www.jsoftware.com/papers/satn41.htm "Composition and Enclosure"]. SATN 41, 1981-06-20.</ref> The concept of function rank was formalized, and applied to most primitives, when the [[Rank operator]] was introduced in 1983.<ref>[https://www.jsoftware.com/papers/satn45.htm "Language Extensions of May 1983"]. SATN-45, 1983-05-02.</ref> In [[J]] every function, primitive or user-defined, has a function rank. | ||
== Definition and properties == | == Definition and properties == | ||