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
Remove all the consonants
Find a subset that divides the vector into equal halves
Fill a zeros matrix
The Answer to Life, the Universe, and Everything
Sum the numbers on the main diagonal
Select every other element of a vector
Remove the polynomials that have positive real elements of their roots.
Remove the vowels
Make the vector [1 2 3 4 5 6 7 8 9 10]
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