This is a robust and accurate circle fit. It works well even if data
points are observed only within a small arc. This circle fit was proposed by V. Pratt in article "Direct least-squares fitting of algebraic surfaces", Computer Graphics, Vol. 21, pages 145-152 (1987). It is more stable than the simple Circle Fit by Kasa (file #5557).
Nikolai Chernov (2021). Circle Fit (Pratt method) (https://www.mathworks.com/matlabcentral/fileexchange/22643-circle-fit-pratt-method), MATLAB Central File Exchange. Retrieved .
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