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
Find relatively common elements in matrix rows
Distance walked 2D
Least common multiple of many numbers
Area of a triangle
Area of a Square
Maximum running product for a string of numbers
Remove the small words from a list of words.
Extract leading non-zero digit
Replace NaNs with the number that appears to its left in the row.
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