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Re: 3D Curve Fitting [message #62744 is a reply to message #62740]

Wed, 01 October 2008 11:04

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

"jaz" <jazpearson@gmail.com> wrote in message
news:126f7c59-020d-43f3-823c-777bb5cbc011@y71g2000hsa.google groups.com...
> I'm trying to fit a curve to some points in 3D space (using a
> polynomial such as a quartic to fit), and was wondering if there was
> any IDL procedure or function that allowed you to do this easily?

You can fit a function like 1 + x + y + z +xy + xz + yz + x^2 + y^2 + z^2
with the svd functions, or the cholesky ( a bit faster). Those termes
lead to the columns of your "A" matrix - there is nothing special about 3D.

Cheers,
bob

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[Message index]

		Re: 3D Curve Fitting By: Craig Markwardt on Thu, 02 October 2008 09:05
		Re: 3D Curve Fitting By: Craig Markwardt on Thu, 02 October 2008 09:01
		Re: 3D Curve Fitting By: Wox on Thu, 02 October 2008 04:50
		Re: 3D Curve Fitting By: Wox on Thu, 02 October 2008 04:13
		Re: 3D Curve Fitting By: jaz on Thu, 02 October 2008 02:59
		Re: 3D Curve Fitting By: R.G. Stockwell on Wed, 01 October 2008 11:04
		Re: 3D Curve Fitting By: Craig Markwardt on Wed, 01 October 2008 10:07
		Re: 3D Curve Fitting By: Craig Markwardt on Wed, 01 October 2008 09:53
		Re: 3D Curve Fitting By: jameskuyper on Wed, 01 October 2008 06:07
		Re: 3D Curve Fitting By: David Fanning on Wed, 01 October 2008 05:19
		Re: 3D Curve Fitting By: Wox on Wed, 01 October 2008 05:04
		Re: 3D Curve Fitting By: Wox on Wed, 01 October 2008 04:50
		Re: 3D Curve Fitting By: Rob.Dimeo on Wed, 01 October 2008 04:08
		Re: 3D Curve Fitting By: Wox on Wed, 01 October 2008 01:55
		Re: 3D Curve Fitting By: jaz on Wed, 01 October 2008 00:35
		Re: 3D Curve Fitting By: russell.grew on Tue, 30 September 2008 17:15

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