Run-length encoding: Difference between revisions

=={{header|Maxima}}==

<lang maxima>rle(a) := block(

[n: slength(a), b: "", c: charat(a, 1), k: 1],

for i from 2 thru n do

if cequal(c, charat(a, i)) then k: k + 1 else (b: sconcat(b, k, c), c: charat(a, i), k: 1),

sconcat(b, k, c)

)$

rle("WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW");

"12W1B12W3B24W1B14W"</lang>