2,951
edits
John Scholes' Conway's Game of Life: Difference between revisions
Jump to navigation
Jump to search
John Scholes' Conway's Game of Life (view source)
Revision as of 14:35, 12 April 2020
, 14:35, 12 April 2020Translations to GNU and dzaima/APL
(Expand on introduction) |
(Translations to GNU and dzaima/APL) |
||
| Line 254: | Line 254: | ||
The final expression ends with a bit of housekeeping using [[Mix]] (<source lang=apl inline>↑</source>) to turn the result back into a simple array (it's currently nested). | The final expression ends with a bit of housekeeping using [[Mix]] (<source lang=apl inline>↑</source>) to turn the result back into a simple array (it's currently nested). | ||
== Translations == | |||
=== GNU APL === | |||
In [[GNU APL]] the [[Inner Product]] <source lang=apl inline>∨.∧</source> results in a twice-[[enclose]]d matrix, rather than once-enclosed as in [[Dyalog APL]]. This can be fixed either by [[mix]]ing twice, or by using a [[Reduce|reduction]] instead of an inner product. | |||
<source lang=apl> | |||
Life←{↑↑1 ⍵∨.∧3 4=+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵} | |||
Life←{↑∨/1 ⍵∧3 4=+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵} | |||
</source> | |||
=== dzaima/APL === | |||
In [[dzaima/APL]] the [[Reduce|reduction]] <source lang=apl inline>+/</source> [[mix]]es its result, which defeats our use of [[scalar extension]] causing a [[LENGTH ERROR]]. Because the sum has only one (matrix) result, enclosing it corrects this issue. | |||
<source lang=apl> | |||
Life←{↑1 ⍵∨.∧3 4=⊂+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵} | |||
</source> | |||
The computation of our example <source lang=apl inline>grid</source> also fails, because dzaima's [[Take]] does not allow overtaking. Instead we can insert the glider into a matrix of zeros using [[structural Under]]: | |||
<source lang=apl> | |||
grid ← ¯10 ¯10↑glider ⍝ DomainError | |||
grid ← glider⍢(¯3 ¯3∘↑) 10 10⍴0 ⍝ This works | |||
</source> | |||
== References == | == References == | ||
<references /> | <references /> | ||