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'''Atomic vector''' (<source lang=apl inline>⎕AV</source>) contains 256 characters. This was the entire character set in some of the older interpreters that did not support [[Unicode]].
{{Built-in|Atomic vector|⎕AV}} is the name of a 256-[[character]] [[vector]] which contains the entire character set of older APL implementations that did not support [[Unicode]], but instead used a single byte to store each character. Its value varies wildly between dialects, and can even differ between editions of the same dialect.


In [[Dyalog APL]]:  
[[Standards|ISO/IEC 13751:2001]] standard defined atomic vector as: "An implementation-defined character vector containing every member of the ''required character set'' exactly once".<ref>BS ISO/IEC 13751:2001: Information technology. Programming languages, their environments and system software interfaces. Programming language Extended APL. (2001).</ref>
<source lang=apl>
      6 41⍴10↓⎕AV
⌶ɫ%'⍺⍵_abcdefghijklmnopqrstuvwxyz��¯.⍬012
3456789�⊢¥$£¢∆ABCDEFGHIJKLMNOPQRSTUVWXYZ�
�ý·⍙ÁÂÃÇÈÊËÌÍÎÏÐÒÓÔÕÙÚÛÝþãìðòõ{€}⊣⌷¨ÀÄÅÆ
⍨ÉÑÖØÜßàáâäåæçèéêëíîïñ[/⌿\⍀<≤=≥>≠∨∧-+÷×?∊
⍴~↑↓⍳○*⌈⌊∇∘(⊂⊃∩∪⊥⊤|;,⍱⍲⍒⍋⍉⌽⊖⍟⌹!⍕⍎⍫⍪≡≢óôöø
"#�&´┘┐┌└┼─├┤┴┬│@ùúû^ü`∣¶:⍷¿¡⋄←→⍝)]� §⎕⍞⍣
</source>


In [[GNU APL]]:
== Value ==
<source lang=apl>
In the following, display of the the character sets are obtained using <syntaxhighlight lang=apl inline>16 16⍴mask\(mask←32≤⎕UCS ⎕AV)/⎕AV</syntaxhighlight> to replace control characters with spaces.
      5 45⍴31↓⎕AV
=== APL2 ===
  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJK
[[APL2]] uses two primary values of <syntaxhighlight lang=apl inline>⎕AV</syntaxhighlight>, an [[wikipedia:ASCII|ASCII]]-based value on [[wikipedia:|personal computer]]s, and an [[wikipedia:EBCDIC|EBCDIC]]-based value on [[wikipedia:mainframe|mainframe]]s. The ASCII-based value is:
LMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwx
<pre>
yz{|}~¥€⇄∧∼≬⋆⋸⌸⌺⌼μ⍁¡⍣⍅⎕⍞⌹⍆⍤⍇⍈⍊⊤λ⍍⍏£⊥⍶⌶⍐⍑χ≢⍖⍗
               
⍘⍚⍛⌈⍜⍢∪⍨⍕⍎⍬⍪∣│┤⍟∆∇→╣║╗╝←⌊┐└┴┬├─┼↑↓╔╚╩╦╠═╬≡⍸⍷∵
               
⌷⍂⌻⊢⊣◊┘┌█▄▌▐▀⍺⍹⊂⊃⍝⍲⍴⍱⌽⊖○∨⍳⍉∈∩⌿⍀≥≤≠×÷⍙∘⍵⍫⍋⍒¯¨ 
  !"#$%&'()*+,-./
</source>
0123456789:;<=>?
@ABCDEFGHIJKLMNO
PQRSTUVWXYZ[\]^_
`abcdefghijklmno
pqrstuvwxyz{|}~
ÇüéâäàåçêëèïîìÄÅ
⎕⍞⌹ôöòûù⊤ÖÜø£⊥₧⌶
áíóúñѪº¿⌈¬½∪¡⍕⍎
░▒▓│┤⍟∆∇→╣║╗╝←⌊┐
└┴┬├─┼↑↓╚╔╩╦╠═╬≡
⍸⍷∵⌷⍂⌻⊢⊣⋄┘┌█▄¦Ì▀
⍺ß⊂⊃⍝⍲⍴⍱⌽⊖○∨⍳⍉∊∩
⌿⍀≥≤≠×÷⍙∘⍵⍫⍋⍒¯¨ 
</pre>


== Links ==
=== APLX ===
* [https://help.dyalog.com/18.0/index.htm#Language/System%20Functions/av.htm Dyalog version 18.0 – Atomic Vector]
In order to maximise the probability of being able to represent the text when converting from Unicode to internal representation, [[APLX]] accepts as input a number of alternative Unicode values for certain characters. However, these are automatically mapped to normalised character, and any unmappable characters are replaced with a question mark.
<pre>
      ⍐ ⍗ ⍇⍈ ⍱⍲
⍒⍋⌽⍉⊖⍟⌶⍫⍎⍕⍀⌿⍝⍞!⌹
¨)<≤=>]∨^≠÷,+./
0123456789([;×:\
¯⍺⊥∩⌊∊_∇{⍳∘'⎕|⊤○
*?⍴⌈~↓∪⍵⊃↑⊂←⊢→≥-
⋄ABCDEFGHIJKLMNO
PQRSTUVWXYZ∆⊣⍪$}


┌┐└┘─│┼├┤┴┬  Í
"#%&@£`≡≢⍷⍸  ⍤⍥⌷
ÄÅÇÉÑÖÜáàâäãåçéè
êëíìîïñóòô⍥õúùûü
ÀÃÕ  Ææ⍬Øø¿¡ßÿ
abcdefghijklmno
pqrstuvwxyz⍙È€
</pre>
=== Dyalog APL ===
<syntaxhighlight lang=apl inline>⎕AV</syntaxhighlight> is obsolete in [[Dyalog APL]] since the Unicode Edition was introduced and is only retained for backwards compatibility.<ref>Bernard Legrand. [https://www.dyalog.com/uploads/documents/MasteringDyalogAPL.pdf#page=525 Mastering Dyalog APL (page 525)]. [[Dyalog Ltd]]. November 2009.</ref> It no longer contains all the [[glyph]]s used for [[primitive function]]s and [[primitive operator|operators]]<ref>[[Adám Brudzewsky]] [https://github.com/abrudz/SBCS/blob/master/README.md#usage SBCS] (Single Byte Character Set) Usage</ref>, but can be adjusted by setting the [[Atomic Vector - Unicode]] (<syntaxhighlight lang=apl inline>⎕AVU</syntaxhighlight>) variable to a list of Unicode code points. The default value is:
<pre>
          ⌶ɫ%'⍺⍵
_abcdefghijklmno
pqrstuvwxyz  ¯.⍬
0123456789 ⊢¥$£¢
∆ABCDEFGHIJKLMNO
PQRSTUVWXYZ  ý·
⍙ÁÂÃÇÈÊËÌÍÎÏÐÒÓÔ
ÕÙÚÛÝþãìðòõ{€}⊣⌷
¨ÀÄÅÆ⍨ÉÑÖØÜßàáâä
åæçèéêëíîïñ[/⌿\⍀
<≤=≥>≠∨∧-+÷×?∊⍴~
↑↓⍳○*⌈⌊∇∘(⊂⊃∩∪⊥⊤
|;,⍱⍲⍒⍋⍉⌽⊖⍟⌹!⍕⍎⍫
⍪≡≢óôöø"# &´┘┐┌└
┼─├┤┴┬│@ùúû^ü`∣¶
:⍷¿¡⋄←→⍝)]  §⎕⍞⍣
</pre>
=== GNU APL ===
[[GNU APL]] is fully Unicode-aware, and only includes the atomic vector for completeness:
<pre>
               
               
!"#$%&'()*+,-./
0123456789:;<=>?
@ABCDEFGHIJKLMNO
PQRSTUVWXYZ[\]^_
`abcdefghijklmno
pqrstuvwxyz{|}~
¥€⇄∧∼≬⋆⋸⌸⌺⌼μ⍁¡⍣⍅
⎕⍞⌹⍆⍤⍇⍈⍊⊤λ⍍⍏£⊥⍶⌶
⍐⍑χ≢⍖⍗⍘⍚⍛⌈⍜⍢∪⍨⍕⍎
⍬⍪∣│┤⍟∆∇→╣║╗╝←⌊┐
└┴┬├─┼↑↓╔╚╩╦╠═╬≡
⍸⍷∵⌷⍂⌻⊢⊣◊┘┌█▄▌▐▀
⍺⍹⊂⊃⍝⍲⍴⍱⌽⊖○∨⍳⍉∈∩
⌿⍀≥≤≠×÷⍙∘⍵⍫⍋⍒¯¨ </pre>
== External links ==
=== Documentation ===
* [http://microapl.com/apl_help/ch_020_070_060.htm APLX]
* [https://help.dyalog.com/latest/index.htm#Language/System%20Functions/av.htm Dyalog]
=== References ===
<references/>
{{APL built-ins}}
[[Category:System constants]]
[[Category:System constants]]
Retrieved from ‘https://aplwiki.com/wiki/Special:MobileDiff/4989...9377’

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