Function rank: Difference between revisions

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 <code>f⍤g</code> were described as "close in the sense that the expression… is applied individually to each subarray argument of <code>g</code>".<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 to SHARP version 19.0 in 1987.<ref>Bernecky, Robert. "An Introduction to Function Rank". APL88 Conference Proceedings. ''ACM SIGAPL Quote Quad'', 18(2), December 1987.</ref> In [[J]] every function, primitive or user-defined, has a function rank.