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
Number of 1s in the Binary Representation of a Number
Roll the Dice!
Project Euler: Problem 7, Nth prime
Back to basics 25 - Valid variable names
Make a 1 hot vector
Determine if input is odd
Make a checkerboard matrix
Find the sum of all the numbers of the input vector
Most nonzero elements in row
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