Given a sequence of points forming a closed path (first and last points are coincident) return the perimeter value.
xy = [ 0,0 ;
L = 4
Remove the polynomials that have positive real elements of their roots.
Increment a number, given its digits
Back to basics 1 - Saving
Find a subset that divides the vector into equal halves
Detect a number and replace with two NaN's
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