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Re: HELP: Levenberg-Marquardt method [message #3698 is a reply to message #3675]

Sat, 04 March 1995 09:17

agraps
Messages: 35
Registered: September 1994

Member

kletzing@unhedi2.unh.edu (Craig Kletzing) writes:

> I believe that the CURVEFIT routine implements Barington's version of
^^^^^^^^^^^^
I believe you mean Bevington (from _Data Reduction
and Error Analysis for the Physical Sciences_, 1969
edition).

> the Levenberg-Marquardt method. This is often not, however, the most
> stable of curve fitting techniques. If your data is not sufficiently
> regular, this method can get lost and find only a local best fit while
> missing other much better fits.

> Craig Kletzing
> University of New Hampshire

Would you care to elaborate? I've used my own version of IDL's CURVEFIT (I
added the capability to output covariance matrices and fixed what I think
is a bug in the final pass of the algorithm) for close to 10 years now
on a wide range of different astronomical/atmospheric data sets, and my
results are usually very good. I would be very interested in knowing
about different/better curvefitting techniques.

Amara

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************************************************************ *************
Amara Graps email: agraps@netcom.com
Computational Physicist vita: finger agraps@sunshine.arc.nasa.gov
Intergalactic Reality bio: finger -lm agraps@netcom.com
************************************************************ *************
"The play's the thing." --Shakespeare

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[Message index]

		Re: HELP: Levenberg-Marquardt method By: agraps on Tue, 07 March 1995 17:04
		Re: HELP: Levenberg-Marquardt method By: kletzing on Mon, 06 March 1995 07:05
		Re: HELP: Levenberg-Marquardt method By: larkum on Mon, 06 March 1995 05:48
		Re: HELP: Levenberg-Marquardt method By: agraps on Sat, 04 March 1995 09:17
		Re: HELP: Levenberg-Marquardt method By: kletzing on Fri, 03 March 1995 11:34

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