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)
Distance walked 3D
Set the array elements whose value is 13 to 0
Find the logic
First non-zero element in each column
Matrix which contains the values of an other matrix A at the given locations.
vectorization in N
Create a matrix X, where each column is a shifted copy of the vector v
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