change the signs of the even index entries of the reversed vector
vec = [4 -1 -2 9]
ans = [9 2 -1 -4]
vec = [-4 -1 -2 -9]
ans = [-9 2 -1 4]
The test suite has been expanded.
First non-zero element in each column
Back to basics 20 - singleton dimensions
Return elements unique to either input
Is the input divisible by 3?
Duplicate a character
Moving average (variable kernel length)
Symmetry of vector
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