Was able to reduce size a few times and finally got to this solution by borrowing tricks used by Grzegorz Knor and Dan.
Can you explain what the +'01'-'0' is doing? I don't see how i+'01'-'0'=[i,i+1].
'01 ' is a char vector of 2 positions: '0' ans '1'.
If you subtract '0' to it, it results a char vector with characters 0 and 1.
So '01'-'0' is the same as [0 1], but because of the '', it cost less operations.
Find common elements in matrix rows
Change the sign of even index entries of the reversed vector
Output any real number that is neither positive nor negative
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