Richard Stallman
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:
⎕←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
References
- ↑ Stallman, Richard M. "RMS Berättar".
- ↑ Stallman, Richard M. "Doggerel"
| APL community [edit] | |
|---|---|
| Activities | Conferences ∙ User groups and meetups ∙ Iverson Award ∙ Exercises |
| Chat rooms and forums | APL Farm ∙ APL Orchard ∙ APL Wiki |
| People | Phil Abrams ∙ Brian Becker ∙ Bob Bernecky ∙ Larry Breed ∙ Charles Brenner ∙ Jim Brown ∙ Adám Brudzewsky ∙ Gitte Christensen ∙ Peter Donnelly ∙ John Earnest ∙ Adin Falkoff ∙ Garth Foster ∙ Lib Gibson ∙ Aaron Hsu ∙ Roger Hui ∙ Ken Iverson ∙ Morten Kromberg ∙ Dick Lathwell ∙ Marshall Lochbaum ∙ Eugene McDonnell ∙ Roger Moore ∙ Trenchard More ∙ Alan Perlis ∙ Raghu Ranganathan ∙ Henry Rich ∙ Al Rose ∙ John Scholes ∙ Ian Sharp ∙ Bob Smith ∙ Geoff Streeter ∙ Joey Tuttle ∙ Arthur Whitney |
| Other | APL Trust ∙ APL Quote Quad ∙ Blogs ∙ Books ∙ Case studies ∙ Famous APL users ∙ Humour ∙ Jobs ∙ Merchandise ∙ Papers ∙ Podcasts ∙ TryAPL ∙ Try It Online ∙ Video channels |