Software FindGraph Closed curves

FindGraph uses parametric equations X(u), Y(u) to fit data with closed curves.

	X(U) = X0 + A1*sin(U)+...+An*cos(n*U)
	Y(U) = Y0 + B1*sin(U)+...+Dn*cos(n*U).

Center point X0,Y0 and the parameters Aj, Bj, Cj, Dj are estimated by the method of least-squares to minimize the difference between the model and data.

If the number of harmonics N = 1, we find ellipse.

The B-spline estimation options include a pure interpolation and a least squares curve approximation. The derivatives are available.

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