John Scholes' Conway's Game of Life: Difference between revisions

John Scholes' Conway's Game of Life (view source)

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-Perhaps the most famous APL video is [[John Scholes]] explaining his own implementation of [[Conway's Game of Life]] in [[Dyalog APL]].<ref>[[John Scholes|Scholes, John]]. [https://www.youtube.com/watch?v=a9xAKttWgP4 "Conway's Game of Life in APL"]. 2009-01-26.</ref> In the video, Scholes develops the following [[dfn]] one step at a time:
+[https://www.youtube.com/watch?v=a9xAKttWgP4 '''John Scholes' Conway's Game of Life''' video] is perhaps the most famous APL video. In it, [[John Scholes]] explains his own implementation of [[Conway's Game of Life]] in [[Dyalog APL]], where he, one step at a time, develops the following [[dfn]]:
 <source lang=apl>
        life ← {⊃1 ⍵ ∨.∧ 3 4 = +/ +⌿ ¯1 0 1 ∘.⊖ ¯1 0 1 ⌽¨ ⊂⍵}
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 === Visualising it ===
-To make the pattern easier to see, we can use [[Bracket indexing|indexing]] to place a <source lang=apl inline>⌺</source> symbol where there's a cell and a <source lang=apl inline>·</source> otherwise, for example:
+To make the pattern easier to see, we can use [[Bracket indexing|indexing]] to place a <source lang=apl inline>⌺</source> symbol where there's a cell and a <source lang=apl inline>·</source> otherwise, for example (note that <source lang=apl inline>⎕IO</source> is [[Index Origin]]):
 <source lang=apl>
        Show←{'·⌺'[⎕IO+⍵]}