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Dyalog APL versions: Difference between revisions
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Text replacement - "High-rank set functions" to "Major cell search"
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Under the direction of [[Roger Hui]], who had been hired by [[Dyalog Ltd.]] in 2011, several features adapted from [[J]] were added. Version 14.0 began the adoption in Dyalog APL of array programming's [[leading axis model]], with built-ins [[Tally]] (<syntaxhighlight lang=apl inline>≢</syntaxhighlight>), [[Key]] (<syntaxhighlight lang=apl inline>⌸</syntaxhighlight>), and the [[Rank operator]] (<syntaxhighlight lang=apl inline>⍤</syntaxhighlight>). [[Function train]]s, another J feature, were also introduced. Of these, Rank differs from J's definition because it does not allow complete [[leading axis agreement]]—instead, two arguments must have identical [[frame]]s or one frame must be empty—and Key has an added monadic case, and differs in that the operand is passed a left argument indicating the unique element used. | Under the direction of [[Roger Hui]], who had been hired by [[Dyalog Ltd.]] in 2011, several features adapted from [[J]] were added. Version 14.0 began the adoption in Dyalog APL of array programming's [[leading axis model]], with built-ins [[Tally]] (<syntaxhighlight lang=apl inline>≢</syntaxhighlight>), [[Key]] (<syntaxhighlight lang=apl inline>⌸</syntaxhighlight>), and the [[Rank operator]] (<syntaxhighlight lang=apl inline>⍤</syntaxhighlight>). [[Function train]]s, another J feature, were also introduced. Of these, Rank differs from J's definition because it does not allow complete [[leading axis agreement]]—instead, two arguments must have identical [[frame]]s or one frame must be empty—and Key has an added monadic case, and differs in that the operand is passed a left argument indicating the unique element used. | ||
Further changes were made in conjunction with the introduction of [[Rank operator|Rank]] and [[leading axis theory]]. [[Index Of]] was [[ | Further changes were made in conjunction with the introduction of [[Rank operator|Rank]] and [[leading axis theory]]. [[Index Of]] was [[Major cell search|extended]] (as in [[J]]) to allow a left argument of [[rank]] greater than 1, searching [[major cell]]s of the left argument. [[Mix]] was extended to increase the rank of each element in its argument to a common rank, rather than giving a [[RANK ERROR]] if they had unequal ranks. This change brought the behavior of Mix into alignment with the result array combination used by the [[Rank operator]] and [[Key]]. An unrelated change was to extend Mix with [[Function axis|axis]] to allow the axis to be a [[vector]] indicating the final positions of each axis of the argument elements (rather than only a [[singleton]] indicating the position of the first axis). This change was made to apply only with a [[migration level]] setting of at least 2; it was extended to all migration levels in [[#18.0|version 18.0]]. | ||
This version allowed [[monadic operator]]s to be manipulated more easily: beginning in 14.0, they can be [[Assignment|named]], grouped with parentheses, and displayed in the [[session]]. It also introduced a new way to form a monadic operator called [[right operand currying]]: a [[dyadic operator]] along with an [[operand]] to its right produces a [[derived operator]]. These changes did not extend to naming, parenthesizing, or displaying dyadic operators, nor to binding a left operant to a dyadic operator. | This version allowed [[monadic operator]]s to be manipulated more easily: beginning in 14.0, they can be [[Assignment|named]], grouped with parentheses, and displayed in the [[session]]. It also introduced a new way to form a monadic operator called [[right operand currying]]: a [[dyadic operator]] along with an [[operand]] to its right produces a [[derived operator]]. These changes did not extend to naming, parenthesizing, or displaying dyadic operators, nor to binding a left operant to a dyadic operator. | ||