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...e related function [[Classify]], which returns a vector of indices instead of a boolean matrix.'' ...ecated in J because of the result size, which can be quadratic in the size of the argument, and [[Roger Hui]] eventually began to use "self-classify" to

...Index Generator]], and [[Interval Index]] for other operations named after indices.'' ...dex returned is one higher than the last index of the left argument. Index Of shares its [[glyph]] <syntaxhighlight lang=apl inline>⍳</syntaxhighlight>

...ed pieces. The left [[argument]] to these operations defines the structure of the partition. This article discusses possible ways partitions can be repre ...es the original vector. A partition contains all the original [[element]]s of the vector, in the same order, but at one greater [[depth]].

...]], [[Index Generator]], and [[Index of]] for other operations named after indices.'' ...ntry immediately preceding—of an array, but may be referred to by the name of a common technique used to solve it, the [[wikipedia:binary search|binary s

...nction]] [[operand]] where specified keys group the indices or major cells of an argument. It was introduced in [[Dyalog APL]] version 14.0 and is common ...left argument, while the right argument is the indices of major cells that match it:

...of [[Unique]] (Nub). More precisely, it indicates all cells which do not [[match]] any earlier indicated cell. The Nub Sieve is more informative than Unique Nub Sieve can be used to filter a [[matrix]] by some of its columns, or find its unique rows.

...rsion of [[SHARP APL]] offered by [[Soliton Associates]]. Notable features of SAX include [[function rank]], the [[Rank operator]], and [[leading axis th ...light lang=apl inline>!</syntaxhighlight> || [[Factorial]] || Out-Of/[[Combinations]]

...h [[wikipedia:first-class function|first-class function]]s, uses a new set of [[glyph]]s with different primitive pairings, and implements [[character ar | <code>≡</code> || [[Depth]] || [[Match]]

...e-like syntax that are implemented across many dialects, or are precursors of such features. Features are ordered by the first APL dialect to implement t ...ate]] (as <syntaxhighlight lang=apl inline>↑↓</syntaxhighlight>), [[Member of]], [[Encode]], [[Decode]], [[Reduce]], [[Compress]], [[Expand]], [[Inner pr

...left arguments. It is closely related to [[Drop]], which removes the parts of each axis that Take would include. Take may be used to get the first few, or last few, elements of a vector:

...oft Windows, and other platforms under Wine. It is the spiritual successor of the first [[NARS]] (Nested Arrays Research System) which was designed and i One feature of NARS2000 is its heavy use of experimental primitive functions & operators. In the table below, symbols w

...s rather than first-class to facilitate features that depend on the number of arguments functions take. ...ining these, each primitive can also be spelled using a name that consists of lowercase letters (user-defined names must have at least one uppercase lett

...the burden of translators, assist speakers, and in general lessen the risk of misunderstandings in conversation. ...erman terminology standard and launched a survey to measure the importance of this.<ref>Dieter Kilsch. [https://apl-germany.de/apl-germany-gse-herbsttagu

...operator derives from a subset (specifically, case 3) of the functionality of [[J]]'s [[Cut]] operator (<syntaxhighlight lang=j inline>;.3</syntaxhighlig ...ing is instead on the space between elements or [[cell]]s. Along the edges of the [[argument]] array, the windows are thus subject to be padded with [[fi

...re on they keyboard they are found for [[typing glyphs|typing them]]. Both of these skills are essential for an effective APL programmer. This article pr ...ght lang=apl inline>⋄</syntaxhighlight>-shaped [[Stencil]] laid on a piece of paper, <syntaxhighlight lang=apl inline>⎕</syntaxhighlight>.