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)
Whether the input is vector?
Multiply 2 numbers
Concatenate two strings
Matrix with different incremental runs
Create a matrix X, where each column is a shifted copy of the vector v
A quadrant matrix
vectorization in N
Remove NaN ?
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