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)
radius of a spherical planet
Create a square matrix of multiples
Square the input
First non-zero element in each column
Remove NaN ?
vectorization in N
Find the elements of a matrix according to a defined property.
A quadrant matrix
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