Richard Stallman

From APL Wiki
Revision as of 08:46, 4 May 2020 by Marshall (talk | contribs) (Text replacement - "\[\[Category:People\|([^]]*)\]\]" to "{{DEFAULTSORT:$1}}Category:People")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search
This article is about Stallman's relationship with APL. For more complete information about Stallman, see Wikipedia.

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[1]. The same year, he also wrote a now famous rhyme:

Rho, rho, rho of X
Always equals 1
Rho is dimension, rho rho rank.
APL is fun![2]

This plays on the fact that X gives the shape (length of each axis; "dimension") of X while ⍴⍴X 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 1 if a vector, and always returns a vector:

      X3 1 4∘.+2 7 1 8
5 10 4 11
3  8 2  9
6 11 5 12
3 4


  1. Stallman, Richard M. "RMS Berättar".
  2. Stallman, Richard M. "Doggerel"
APL community [edit]
Activities BAA sessionsDyalog user meetingsDyalog webinarsAPL Problem Solving CompetitionConferencesIverson AwardCode golfAPL CultivationAdvent of CodeSharing code
User groups APL Borealis (Canada) ∙ APL et J (France) ∙ APL Germany (terminology) ∙ BAA (UK) ∙ FinnAPL (Finland) ∙ JAPLA (Japan) ∙ SAUG (Switzerland) ∙ SIGAPL (USA) ∙ SwedAPL (Sweden)
People Phil AbramsBrian BeckerBob BerneckyLarry BreedCharles BrennerJim BrownAdám BrudzewskyGitte ChristensenPhilip Van CleavePeter DonnellyDan DyerAdin FalkoffGarth FosterAaron HsuRoger HuiKen IversonMorten KrombergMarshall LochbaumEugene McDonnellJohn McPhersonJon McGrewDonald McIntyreRoger MooreAlex MorrowAlan PerlisAl RoseWilliam RutiserJohn ScholesIan SharpLynne ShawBob SmithGeoff StreeterRoy SykesRaymond TisserandArthur WhitneyClark Wiedmann
Other APL OrchardSubredditsAPL WikiBlogsForumsBooksPapersAPL Quote QuadHumour