[R] How to find the best fit of inner cut ellipse to points in polar plot?

[Abby Spurdle]

(1) There is no csv attached (may have been removed).
(2) If you have a "polar plot", then wouldn't the "center" be the
origin of the plot/coordinates?
(3) If you don't need an exact ellipse, you could transform your
coordinates into cartesian coordinates, and then use a periodic form
of regression.
(4) If you need an exact ellipse, then you would have (three?)
parameters, ignoring the center.
If you work out the R formula, then you could try nonlinear
regression, to estimate those parameters, maybe...

On Wed, Dec 4, 2019 at 1:09 AM vod vos via R-help <r-help using r-project.org> wrote:
>
> hi,
>
> 1. How to find the best fit of  inner cut ellipse to points in polar plot?
>
> 2. How can we find the ellipse passing through  most of the points in polar plot?
>
> And can we get the center x, center y, major radius, minor radius, and rotation angle of the ellipse?
>
> The csv data is attached.
>
> Thanks.
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