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.
So many choices
Return elements unique to either input
Test if two numbers have the same digits
Insert zeros into vector
Create matrix of replicated elements
Symmetry of vector
Moving average (variable kernel length)
Duplicate a character
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