for an n-dimensional vector x, the function should return another vector 2n-dimension which each element is repeated twice.
in->[2 3 NaN 5] and out->[2 2 3 3 NaN NaN 5 5]
improve test suit
This solution only works for vectors that are already sorted from low to high :) but it passed the test suite
This works in R2012b, but not on cody
function ans = duplicate(x)
Select every other element of a vector
Solving Quadratic Equations (Version 1)
Matrix with different incremental runs
vectorization in N
First non-zero element in each column
Create a matrix X, where each column is a shifted copy of the vector v
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