System Function AV: Difference between revisions

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<h1><apl>{quad}AV</apl> - Atomic Vector</h1>
<h1><aplxx>⎕AV</aplxx> - Atomic Vector</h1>
<apll>{quad}AV</apll> is an ISO 13751 standard niladic system function which returns the entire character set.
<apll>{quad}AV</apll> is an [https://www.iso.org/standard/22817.html ISO/IEC 13751] standard [[niladic]] system function which returns the entire character set.
{{Box3
{{BoxStart
|<apll>Z←⎕AV</apll>
|<apll>Z←⎕AV</apll>
|returns the Atomic Vector for the NARS2000 system.
|returns the Atomic Vector for the NARS2000 system.}}
|<apll>Z</apll> is a character vector with 2<sup>16</sup> (65,536) elements.}}
{{BoxEnd|<apll>Z</apll> is a character vector with 2<sup>16</sup> (65,536) Unicode character elements, 0 to 65535 or hex values 0000 thru FFFF.}}


<p>Because NARS2000 is based upon Unicode (i.e., UCS-2), its Atomic Vector has one element for each possible 16-bit character value.  Moreover, the elements of the Atomic Vector are ordered such that, in index-origin zero, <apll>((⌈2⍟⍴⎕AV)⍴2)⊤⎕AV⍳'X'</apll> gives the bit representation of <apll>'X'</apll>.</p>
<p>Because NARS2000 is based upon Unicode (i.e., UCS-2), its Atomic Vector has one element for each possible 16-bit character value.  Moreover, the elements of the Atomic Vector are ordered such that, in index-origin zero, <apll>((⌈2⍟⍴⎕AV)⍴2)⊤⎕AV⍳'X'</apll> gives the bit representation of <apll>'X'</apll>.</p>
'''See also: [[Unicode|Unicode page]] and [[System_Function_UCS|⎕UCS]]'''.


Note that ⎕AV is a ''niladic'' function, you cannot assign anything to it.
{{SFN|AV}}
 
{{System Variables}}

Latest revision as of 11:22, 16 April 2018

⎕AV - Atomic Vector

⎕AV is an ISO/IEC 13751 standard niladic system function which returns the entire character set.

Z←⎕AV returns the Atomic Vector for the NARS2000 system.
Z is a character vector with 216 (65,536) Unicode character elements, 0 to 65535 or hex values 0000 thru FFFF.

Because NARS2000 is based upon Unicode (i.e., UCS-2), its Atomic Vector has one element for each possible 16-bit character value. Moreover, the elements of the Atomic Vector are ordered such that, in index-origin zero, ((⌈2⍟⍴⎕AV)⍴2)⊤⎕AV⍳'X' gives the bit representation of 'X'.

See also: Unicode page and ⎕UCS.


Note: ⎕AV is a niladic form system function, you cannot assign a value to it.

System Variables (A value may be assigned to these except for ⎕DM)
⎕ALX ⎕CT ⎕DM ⎕DT ⎕ELX ⎕FC ⎕FEATURE ⎕FPC ⎕IC ⎕IO
⎕LR ⎕LX ⎕PP ⎕PR ⎕PW ⎕RL ⎕SA ⎕WSID
Niladic System Functions (a value cannot be assigned to these)
⎕A ⎕AV ⎕EM ⎕ET ⎕LC ⎕NNAMES ⎕NNUMS ⎕SI ⎕SYSID ⎕SYSVER
⎕T ⎕TC ⎕TCBEL ⎕TCBS ⎕TCESC ⎕TCFF ⎕TCHT ⎕TCLF ⎕TCNL ⎕TCNUL
⎕TS ⎕WA
Monadic or dyadic system functions (a value cannot be assigned to these)
⎕AT ⎕CR ⎕DC ⎕DFT ⎕DL ⎕DR ⎕EA ⎕EC ⎕ERROR ⎕ES
⎕EX ⎕FMT ⎕FX ⎕MF ⎕NAPPEND ⎕NC ⎕NCREATE ⎕NERASE ⎕NINFO ⎕NL
⎕NLOCK ⎕NREAD ⎕NRENAME ⎕NREPLACE ⎕NRESIZE ⎕NSIZE ⎕NTIE ⎕NUNTIE ⎕STOP ⎕TF
⎕TRACE ⎕UCS ⎕VR
Note that quad functions and variables (except for the ⎕A family of functions) are case insensitive


See Also
System Commands System Variables and Functions Operators


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