@Cris Luengo, filter2 is not a toolbox function, (I am not aware if it was earlier or not) and should be allowed now.
Strictly incomprehensible for me.
Well done :!
Really nifty!! ;-)
Back to basics 2 - Function Path
"Look and say" sequence
Change the sign of even index entries of the reversed vector
Output any real number that is neither positive nor negative
Generate a random matrix A of (1,-1)
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