Given a "counting sequence" vector x, construct the original sequence y.
A counting sequence is formed by "counting" the entries in a given sequence. This is sometimes called run-length encoding.
For example, the sequence
x = 2, 5, 1, 2, 4, 1, 1, 3
can be read as
Two 5's, one 2, four 1's, one 3
which translates to
y = 5, 5, 2, 1, 1, 1, 1, 3
So y is the reconstructed vector that corresponds to the counting sequence x.
For this problem, all elements in the sequences x and y will be in the range from 1 to 9.
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.
note: repelem did not exist back when this problem was created
not limited to 1-9
This is my favourite
156 Solvers
Back to basics 13 - Input variables
196 Solvers
Set the array elements whose value is 13 to 0
669 Solvers
Create a two dimensional zero matrix
251 Solvers
Deleting an element in a matrix
223 Solvers