Ellipse fitting in python?

[Christopher T King]

On Wed, 14 Jul 2004, Fernando Perez wrote:

> A quick comment in case it's not obvious: an ellipse is not a function in
> Cartesian coordinates, and most standard LS solvers expect a function.  So
> it's probably best to convert things over to polar before feeding the data to
> the LS solver.

You could break both the ellipse and the data into two pieces (say, y>=K 
and y<K).  Polar coordinates might get you more uniform results, though.