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Richard Stallman: Difference between revisions
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'''Richard Matthew Stallman''', founder of the GNU Project, was an early adopter of APL, and used it to write a text editor as a high school student in the summer of 1969<ref>Stallman, Richard M. [http://www.lysator.liu.se/history/garb/txt/87-2-rms.txt "RMS Berättar"].</ref>. The same year, he also wrote a now famous rhyme: | '''Richard Matthew Stallman''', founder of the GNU Project, was an early adopter of APL, and used it to write a text editor as a high school student in the summer of 1969<ref>Stallman, Richard M. [http://www.lysator.liu.se/history/garb/txt/87-2-rms.txt "RMS Berättar"].</ref>. 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!<ref>Stallman, Richard M. [https://stallman.org/doggerel.html#APL "Doggerel"]</ref></blockquote> | <blockquote>Rho, rho, rho of X<br>Always equals 1<br>Rho is dimension, rho rho rank.<br>APL is fun!<ref>Stallman, Richard M. [https://stallman.org/doggerel.html#APL "Doggerel"]</ref></blockquote> | ||
This plays on the fact that <syntaxhighlight lang=apl inline>⍴X</ | This plays on the fact that <syntaxhighlight lang=apl inline>⍴X</syntaxhighlight> gives the [[shape]] (length of each [[axis]]; "dimension") of <syntaxhighlight lang=apl inline>X</syntaxhighlight> while <syntaxhighlight lang=apl inline>⍴⍴X</syntaxhighlight> 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 <syntaxhighlight lang=apl inline>1</syntaxhighlight> if a [[vector]], and <syntaxhighlight lang=apl inline>⍴</syntaxhighlight> always returns a vector: | ||
<syntaxhighlight lang=apl> | <syntaxhighlight lang=apl> | ||
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⍴⍴⍴X | ⍴⍴⍴X | ||
1 | 1 | ||
</ | </syntaxhighlight> | ||
== References == | == References == | ||