I pared it down to only needing 3 points.

EllipseParameters extractEllipseParameters(const Eigen::VectorXd& coefficients)
{
    //A(i, 0) = x * x;
    //A(i, 1) = 0;// x* y;
    //A(i, 2) = x * x;
    //A(i, 3) = 0;// x;
    //A(i, 4) = y;

    double a = coefficients(0);
    double b = 0;
    d…