Remove the middle element of a vector?
[1,2,3] should return 2
[1,2,3,4] should return 2
 should return empty vector
Remove or return ?
keep it or remove it? confused example.
Select every other element of a vector
Remove any row in which a NaN appears
Solve the set of simultaneous linear equations
Flip the bit
Find out total non zero element of matrix
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