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Re: 3D Curve Fitting [message #62748 is a reply to message #62747]

Wed, 01 October 2008 09:53

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

jaz <jazpearson@gmail.com> writes:
> Yeah i've seen this, but it only seems to do up to 2D. Or am i missing
> a trick here?

MPFIT doesn't really care about the dimensionality of your data. All
it really needs is a function which returns a set of residuals. For
example, if you have a set of measured *heights* above the XY plane,
and want to fit to the surface function Z(X,Y), then, you can easily
do something like,
MPFITFUN('MYFUNC', [X,Y], Z, ...)
As long as your MYFUNC handles several stacked input variables, it
should easily be able to return the model Z heights.

More information,
http://cow.physics.wisc.edu/~craigm/idl/fitqa.html#multivar

But your original question said you wanted to "fit a curve to some
points in 3D space ... such as a quartic..." That's a little too
generic. A quartic function of *what*?

Craig

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Craig B. Markwardt, Ph.D. EMAIL: cbmarkwardt+usenet@gmail.com
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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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