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
How to find the position of an element in a vector without using the find function
Project Euler: Problem 5, Smallest multiple
Whether the input is vector?
Fill a zeros matrix
Output any real number that is neither positive nor negative
Add two numbers
Swap the first and last columns
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