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→History: Sane things come from Rationalized APL, not the Dictionary, as a rule
(More official that it'll be added.) |
(→History: Sane things come from Rationalized APL, not the Dictionary, as a rule) |
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== History == | == History == | ||
From (<code>{</code>) was introduced in | From (<code>{</code>) was introduced in 1983 by [[Rationalized APL]]. This description introduced the characteristic feature of selection of multiple cells simultaneously, along with scatter-point indexing and the ability to exclude rather than include indices using a third level of boxing. It was expanded slightly in [[A Dictionary of APL]] to allow negative indices and was paired with monadic [[Catalogue]], giving the same meaning for <code>{</code> now used in [[J]]. [[Roger Hui]] expressed his support for the new definition with a presentation at [[APL87]],<ref>[[Roger Hui]]. [https://www.jsoftware.com/papers/from.htm Some Uses of <code>{</code> and <code>}</code>] at [[APL87]].</ref> and it was included in J from the earliest drafts in 1990—a limited version had even appeared in [[Arthur Whitney]]'s one-page interpreter prototype. | ||
[[SHARP APL]] followed A Dictionary of APL and used <code>{</code>, but this was later deprecated, programmers being told to use <code>@</code> instead.<ref>Soliton Associates Limited. SHARP APL for UNIX Language Guide. [https://abrudz.github.io/SAX2/SAX61.pdf#G41.16516 Deprecated Primitives: Braces]. 2000.</ref> | [[SHARP APL]] followed A Dictionary of APL and used <code>{</code>, but this was later deprecated, programmers being told to use <code>@</code> instead.<ref>Soliton Associates Limited. SHARP APL for UNIX Language Guide. [https://abrudz.github.io/SAX2/SAX61.pdf#G41.16516 Deprecated Primitives: Braces]. 2000.</ref> | ||