Implementation Detail

[itissid]

Hi I was looking at the implementation of the Kneedle class's method if differences to find the optima for Elbow and Knee location.

Could one not use the max of the second derivatives(curvature) to find this? In which case I don't think you have to worry about convexity and direction.

[d-kleine]

Curvature and second derivative are different mathematical concepts, see here. The autors of kneed algorithm explain everything about it in this article here.