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
Back to basics 13 - Input variables
Stuff the Board
Length of the hypotenuse
Max of a Vector
Replace NaNs with the number that appears to its left in the row.
Make a Palindrome Number
It dseon't mettar waht oedrr the lrettes in a wrod are.
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