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• Ranking poker hands
  ...f <syntaxhighlight lang=apl inline>handrank</syntaxhighlight> above has an error: it ranks flushes above straights. This can be fixed by [[Reverse|reversing ...describe each card with an [[index]] for its rank (two to ace) and another index for its suit (clubs to spades). The function <syntaxhighlight lang=apl inli
  13 KB (1,398 words) - 22:22, 10 September 2022
• Humour
  ...t [[index origin]], which leads to [[wikipedia:off-by-one error|off-by-one error]]s even more often in APL than usually seen in programming. * [[Roger Hui]], a strong proponent of fixing index origin ― <syntaxhighlight lang=apl inline>⎕IO</syntaxhighlight> ― at
  15 KB (2,230 words) - 14:57, 4 March 2024
• Dyalog APL Vision
  | index origin = 0 or 1 | <code>⎕EM'RANK ERROR' 'WS FULL'</code> gives <code>4 1</code>
  9 KB (1,087 words) - 15:09, 6 March 2024
• Unique
  ...nique of an array, the major cells are considered in order of increasing [[index]]. Each cell is included if it does not [[match]] any cell which was alread ...allow a [[scalar]] argument ([[scalar rank extension]]), K gives a [[RANK ERROR]] if the argument is not a list.
  9 KB (1,243 words) - 12:57, 23 November 2023
• J
  | index origin = 0 | 6.0 || 1992-10-24 || Error handling with <syntaxhighlight lang=j inline>::</syntaxhighlight>, addition
  17 KB (2,223 words) - 20:31, 14 April 2024
• Extended Dyalog APL
  | index origin = 0 or 1 | Error Message || <syntaxhighlight lang=apl inline>⎕EM</syntaxhighlight> || 🔺
  13 KB (1,445 words) - 15:08, 6 March 2024
• John Scholes' Conway's Game of Life
  ...ple (note that <syntaxhighlight lang=apl inline>⎕IO</syntaxhighlight> is [[Index Origin]]): ...s result, which defeats our use of [[scalar extension]] causing a [[LENGTH ERROR]]. Because the sum has only one (matrix) result, enclosing it corrects this
  19 KB (1,783 words) - 11:49, 1 November 2023
• APL Campfire
  ...[wikipedia:MVS|MVS]], [[SAX]], [[Dfn]], evolution of [[J]], [[Variant]], [[Index origin]], modern times. || [https://www.youtube.com/watch?v=65HOCGnLNXk&lis
  13 KB (1,708 words) - 23:39, 15 April 2024
• FinnAPL idiom library
  |rowspan=2|1. || Progressive index of (without replacement) ||style="text-align: right;"|<syntaxhighlight lang ...and <syntaxhighlight lang=apl inline>Y</syntaxhighlight>. It will find the index position of each element of <syntaxhighlight lang=apl inline>Y</syntaxhighl
  228 KB (28,000 words) - 22:16, 10 September 2022
• APL conference
  * '''Index'''. [https://doi.org/10.1145/800114.803709]. * '''Information retrieval with APL by adaptive index and user guidance'''. Hans-Joerg Schek and Georg Walch. [https://doi.org/10
  168 KB (20,470 words) - 00:01, 16 April 2024

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