Is there a way to curve fit a nonlinear implicit function?

Hi
I would like to fit a least squares curve to a set of data points. I see I can do this using general LSQ fit.vi or Levenberg-Marquadt, but these VIs seem to only handle implicit functions of the form y=f(x,A).
What if I have a data set from a known implicit function, for example a circle:
(x-x0)^2 + (y-y0)^2 - r^2 = 0
How can I calculate the x0, y0 and r that minimizes the square error? Can this be done using the L-M VI or a VI from a different toolkit?
Thank you.
Laine

This can be considered as an optimization problem. For a circle, you could use the fitting on a sphere vi (in the math > optimization sub-palette), giving 0 as z coordinates. See the attached vi.
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
Find Circle.vi ‏26 KB

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Message was edited by: K Paton

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