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
Test if a Number is a Palindrome without using any String Operations
vectorization in N
Convert a numerical matrix into a cell array of strings
Flag largest magnitude swings as they occur
Min of a Matrix
Find all elements less than 0 or greater than 10 and replace them with NaN
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