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
Tic Tac Toe FTW
Back to basics 13 - Input variables
Find the logic
Spot the First Occurrence of 5
Find MPG of Lightest Cars
Find relatively common elements in matrix rows
Select every other element of a vector
Word Counting and Indexing
Back and Forth Rows
Find the two-word state names
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