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
Solve the set of simultaneous linear equations
Make a run-length companion vector
sum of non-primes
Sum the Digits of a Number
04 - Scalar Equations 2
Tic Tac Toe FTW
Renaming a field in a structure array
Read a column of numbers and interpolate missing data
Alphabetize by last name
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