Approximation 2D Approximation 2D Least squares fit of circle. For points on an arc subtending a small angle, the initial guess for circle center is not a good one. The eigensolver is used to get an initial guess by fitting the data with a Gaussian distribution. Function HeightLineFit is a fit using distances in y. Function OrthogonalLineFit uses distances orthgonal to the proposed line.
Special case applies to fitting points by circle.