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GNU APL: Difference between revisions
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| run online = [http://juergen-sauermann.de/try-GNU-APL try-GNU-APL] | | run online = [http://juergen-sauermann.de/try-GNU-APL try-GNU-APL] | ||
}} | }} | ||
'''GNU APL''' is a free and (almost) complete implementation of Extended APL as specified in [[ISO/IEC 13751:2001]] and is thus similar to [[APL2]]. It runs on GNU/Linux and on Windows using Cygwin, and uses Unicode internally. GNU APL was written and is being maintained by [[Jürgen Sauermann|GNU APL community]] | '''GNU APL''' is a free and (almost) complete implementation of Extended APL as specified in [[ISO/IEC 13751:2001]] and is thus similar to [[APL2]]. It runs on GNU/Linux and on Windows using Cygwin, and uses Unicode internally. GNU APL was written and is being maintained by [[Jürgen Sauermann|GNU APL community]], implementing: | ||
* nested arrays and related functions | * nested arrays and related functions | ||
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* a shared variable interface | * a shared variable interface | ||
In addition, GNU APL can be scripted. | Besides for running in the classic interactive mode locally, there is an (experimental) online version of GNU APL. In addition, GNU APL can be scripted. | ||
== Richard Stallman == | |||
[[wikipedia:Richard Stallman|Richard Stallman]], founder of the GNU Project, was an early adopter of APL, using it to write a text editor as a high school student in the summer of 1969. The same year, he also wrote a now famous rhyme: | |||
<blockquote>Rho, rho, rho of X<br>Always equals 1<br>Rho is dimension, rho rho rank.<br>APL is fun!</blockquote> | |||
This plays on the fact that <source lang=apl inline>⍴X</source> gives the [[shape]] (length of each [[axis]]; "dimension") of <source lang=apl inline>X</source> while <source lang=apl inline>⍴⍴X</source> gives the [[rank]] (number of axes/dimensions) and since the number of axes is always a count, it is a single number, which has the shape <source lang=apl inline>1</source> if a [[vector]], and <source lang=apl inline>⍴</source> always returns a vector: | |||
<source lang=apl> | |||
⎕←X←3 1 4∘.+2 7 1 8 | |||
5 10 4 11 | |||
3 8 2 9 | |||
6 11 5 12 | |||
⍴X | |||
3 4 | |||
⍴⍴X | |||
2 | |||
⍴⍴⍴X | |||
1 | |||
</source> | |||
== Encoding == | |||
It should be noted that GNU APL tends to prefer the [[Unicode]] ''Lozenge'' (U+25CA; <source lang=apl inline>◊</source>) and ''Element of'' (U+2208; <source lang=apl inline>∈</source>) over ''Diamond operator'' (U+22C4; <source lang=apl inline>⋄</source>) and ''Small Element of'' (U+220A; <source lang=apl inline>∊</source>) which are more commonly used by dialects. This can lead to [[SYNTAX ERROR]]s if attempting to use code written for GNU APL in other implementations. However, GNU APL also accepts the more common code points. | |||
== External links == | == External links == | ||