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)
Times 2 - START HERE
Replace NaNs with the number that appears to its left in the row.
surface of a spherical planet
Determine Whether an array is empty
Create a matrix X, where each column is a shifted copy of the vector v
First non-zero element in each column
vectorization in N
A quadrant matrix
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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