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Iverson continued to refine his definition of Nub. He included it in his [[Rationalized APL]] specification with no changes in 1983, but modified it to work on [[major cell]]s (thus aligning it with [[leading axis theory]]) in his 1987 [[A Dictionary of APL]]. Iverson's dictionary also changed the symbol for Nub to <source lang=apl inline>↑</source>, added the functions [[Nub Sieve]] (<source lang=apl inline>≠</source>) and [[Nub in]] (<source lang=apl inline>=</source>), and defined Nub in terms of Nub Sieve. These definitions were adopted by [[IPSA]] in the [[SHARP APL]] successor [[SAX]]. [[J]] uses similar definitions: its Nub-related functions are Nub (<source lang=j inline>~.</source>), [[Nub Sieve]] (<source lang=j inline>~:</source>), and [[Self-Classify]] (<source lang=j inline>=</source>). However, Self-Classify is indicated as deprecated in J's NuVoc because its result can be much larger than its argument. | Iverson continued to refine his definition of Nub. He included it in his [[Rationalized APL]] specification with no changes in 1983, but modified it to work on [[major cell]]s (thus aligning it with [[leading axis theory]]) in his 1987 [[A Dictionary of APL]]. Iverson's dictionary also changed the symbol for Nub to <source lang=apl inline>↑</source>, added the functions [[Nub Sieve]] (<source lang=apl inline>≠</source>) and [[Nub in]] (<source lang=apl inline>=</source>), and defined Nub in terms of Nub Sieve. These definitions were adopted by [[IPSA]] in the [[SHARP APL]] successor [[SAX]]. [[J]] uses similar definitions: its Nub-related functions are Nub (<source lang=j inline>~.</source>), [[Nub Sieve]] (<source lang=j inline>~:</source>), and [[Self-Classify]] (<source lang=j inline>=</source>). However, Self-Classify is indicated as deprecated in J's NuVoc because its result can be much larger than its argument. | ||
[[A+]] does not include Unique or any related functions, but [[K]]'s function range (< | [[A+]] does not include Unique or any related functions, but [[K]]'s function range (<code>?</code>) gives the unique elements of a list argument. In later versions it is called "distinct" or "unique". While APLs allow a [[scalar]] argument ([[scalar rank extension]]), K gives a [[RANK ERROR]] if the argument is not a list. | ||
== APL model == | == APL model == | ||