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Re: Incorrect fit of elliptic to data [message #36000 is a reply to message #35999]

Mon, 04 August 2003 12:29

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"active-news" <johan_marais@absamail.co.za> writes:

> I am using the program from David Fanning's site (FIT_ELLIPS) to fit an
> ellips to edge points detected from profiles but the fitted ellips seems to
> be bigger than the supplied data. Anyone that can help?

(a) you just dumped a big uuencoded file into the newgroup. Why?

(b) you uuencoded the text edges.pro file too. Why?

(c) It was difficult to get your script to work. There was no
documentation. Depending on where I clicked, I got different results,
I suppose I am supposed to click the center? The logic of the program
is complex enough that it is difficult to decide what *should* be
happening.

(c) you assumed that Fanning's fit_ellipse function is for fitting
elliptical shells, when clearly the examples show solid elliptical
disks. That script computes the size of the ellipse based on the
moment of inertial of the "blob." Is that what you want?

(d) Have you considered other programs, which actually fit an
elliptical contour to XY scatter data? (such as MPFITELLIPSE)

Craig

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[Message index]

		Re: Incorrect fit of elliptic to data By: active-news on Mon, 04 August 2003 14:06
		Re: Incorrect fit of elliptic to data By: David Fanning on Mon, 04 August 2003 12:38
		Re: Incorrect fit of elliptic to data By: Craig Markwardt on Mon, 04 August 2003 12:29

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