Created
September 27, 2016 06:39
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Run-length encoding in APL
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| s ← 'AAABABBBBSSWSWSSSSSSS' | |
| runEnds ← (2 ≠/ s) , 1 ⍝ 1 if an element ends a run | |
| counts ← ¯2 -/ 0 , runEnds / ⍳⍴ s ⍝ num elements in each run | |
| counts ,¨ runEnds / s | |
| 3 A 1 B 1 A 4 B 2 S 1 W 1 S 1 W 7 S |
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