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
surface of a spherical planet
Check if number exists in vector
select the primes of a vector
Divide by 4
Create a vector
Remove the vowels
Find the peak 3n+1 sequence value
Alphabetize by last name
Find the palindrome
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