It finds the UIK estimation for elbow or knee point of a curve, see  for details.
The numeric vector of x-abscissas, must be of length at least 4.
The numeric vector of y-abscissas, must be of length at least 4.
Given the x, y numeric vectors it first checks the curve by using
and classifies it as convex, concave or convex/concave, concave/convex.
It returns the x-abscissa which is the UIK estimation for the knee point.
Demetris T. Christopoulos
 Christopoulos, Demetris T., Introducing Unit Invariant Knee (UIK) As an Objective Choice for Elbow Point in Multivariate Data Analysis Techniques (March 1, 2016). Available at SSRN: https://ssrn.com/abstract=3043076 or http://dx.doi.org/10.2139/ssrn.3043076
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