This Test suite sucks.. it does not let pass a right solution.........
The test suite does not check that y has n elements.
middleAsColumn: Return all but first and last element as a column vector
Arrange vector in ascending order
Flag largest magnitude swings as they occur
Change the sign of even index entries of the reversed vector
Only once: cleaning up your columns
Insert certain elements into a vector.
Return 'on' or 'off'
Convert nested struct-array to numeric array
Create incremental spiral WITHOUT USING EVAL or FEVAL
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