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
Is A the inverse of B?
Area of a triangle
Find the nearest prime number
Read a column of numbers and interpolate missing data
Find the longest sequence of 1's in a binary sequence.
Remove the polynomials that have positive real elements of their roots.
Find common elements in matrix rows
Extract leading non-zero digit
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