Difference between revisions of "K"

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Line 13: Line 13:
 
| license                  = Free for personal use / Proprietary commercial software (free open source implementations exist)
 
| license                  = Free for personal use / Proprietary commercial software (free open source implementations exist)
 
| website                  = [https://kx.com/ Kx Systems], [https://shakti.com/ Shakti]
 
| website                  = [https://kx.com/ Kx Systems], [https://shakti.com/ Shakti]
| documentation            = [http://kparc.com/k.txt K4] [https://kparc.github.io/ref/ K9]
+
| documentation            = [http://kparc.com/k.txt K4], [https://kparc.github.io/ref/ K9], [https://k.miraheze.org/ Wiki]
 
| download                = [https://kx.com/connect-with-us/download/ K4], [https://shakti.com/download/ K9]
 
| download                = [https://kx.com/connect-with-us/download/ K4], [https://shakti.com/download/ K9]
 
| influenced by            = [[A+]], [[wikipedia:Scheme_(programming_language)|Scheme]]
 
| influenced by            = [[A+]], [[wikipedia:Scheme_(programming_language)|Scheme]]

Latest revision as of 11:57, 3 August 2021

K denotes a family of programming languages designed by Arthur Whitney and commercialized by Morgan Stanley, Kx Systems, and Shakti. In 1985, while at Morgan Stanley, Whitney created the statically typed A dialect of APL. His colleagues extended A into A+ in 1988. Finally, Whitney presented the first K implementation in 1992, a "reduced instruction set" dialect which only used ASCII glyphs and limited arrays to (nested) vectors. For a long time, K's main role was as implementation languagesfor Q, the query language of kdb+, which is an in-memory, column-based database. K7 (the first "Shakti K") was the first K to have full Unicode support, and it also uses a limited set non-ASCII glyphs in the core language, for example Ø and , however non-ASCII glyphs were removed in the subsequent K9.

Releases

See The Evolution of Database Software.

Year Version
1992 K0
1994 K1
1996 K2
2000 K4
unreleased K5
unreleased K6
2018 K7 (Shakti)
doesn't exist K8
2020 K9 (Shakti)

Primitives

K3

From the Kona Wiki.

Verb Monadic Dyadic Triadic Tetradic
+ flip (Transpose) plus
- negate minus
* first times
% reciprocal divide
| reverse max|or
& where min|and
^ shape power
! enumerate (includes Iota) rotate|mod
< grade up less than
> grade down greater than
= group equals
~ not, attribute match
@ atom at index amend/trap amend
? range (Unique) function inverse/find/draw/deal/sample invert-guess
_ floor drop|cut
, enlist (like Enclose) join
# count take|reshape
$ format dollar (conversions)
. make/unmake dictionary dot index amend/trap amend
: colon assignment
Adverb Definition
/ over (includes Reduce and Power)
\ scan
' each
/: each right
\: each left
': eachpair (like Windowed Reduce)

External links

APL dialects [edit]
Maintained APL+WinAPL2APL64APL\ivApletteAprilCo-dfnsDyalog APLdzaima/APLExtended Dyalog APLGNU APLKAPNARS2000Pometo
Historical A Programming LanguageA+ (A) ∙ APL#APL\360APL/700APL\1130APL\3000APL.68000APL*PLUSAPL.jlAPL.SVAPLXIverson notationIVSYS/7090NARSngn/aplopenAPLPATRowanSAXSHARP APLRationalized APLVisualAPL (APLNext) ∙ VS APLYork APL
Derivatives AHPLBQNCoSyELIGleeIIvyJJellyJellyfishK (Q, KDB+) ∙ NialRAD
Overviews Timeline of array languagesTimeline of influential array languagesFamily tree of array languages