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Topic: Least square fit of nonlinear equations
Replies: 2   Last Post: May 7, 2011 10:26 PM

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Posts: 74
Registered: 12/7/04
Re: Least square fit of nonlinear equations
Posted: May 7, 2011 10:26 PM
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Marquardt-Levenberg-Spencer-Anselmo steepest descent. Set the sum of all
equations to zero Be careful for multiple roots. MatLab, Mathematica and
their sourceforge.net free/open clones all have this. Spencer worked for
Marquardt at duPont, Anselmo was Spencer's doctoral student at COlumbia.
Fifteen years ago there were some issues with matlab nonlin I don't remember.
A lot of econometric systems (rats, eviews, r-language) have nonline also.
Most theoretical mathematicianc complain nonlin methods allow folks to
develop models they don't really understand. As an undergrad (1979-81) I used
to love the nonlin in (DEC20) Mlab (civilized.com) but neither I nor people I
work with can really afford the current version.

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Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
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