See my function "seqle" on FileExchange. It may not be as compact, but it's easy to use and both encodes and decodes.
The problem statement would have been clearer if the principle of RLE had been explained with an encoding example first. Alternatively, it would have been useful to explicitly mention that the data in vector x is being read pairwise.
ugly but more fun than loops!
note: repelem did not exist back when this problem was created
not limited to 1-9
This is my favourite
Best score without regexp
Most nonzero elements in row
Which doors are open?
Find common elements in matrix rows
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Divisible by 2
Encode Roman Numerals
Remove the vowels
Swap the first and last columns
Find relatively common elements in matrix rows
Find the two-word state names
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