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
Sum all integers from 1 to 2^n
Implement simple rotation cypher
Sum the numbers on the main diagonal
find the maximum element of the matrix
Matlab Basics - Rounding I
Determine whether a vector is monotonically increasing
Implement a ROT13 cipher
Connect Four Win Checker
Which doors are open?
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