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Re: Levenberg-Marquardt ?

  • To: mathgroup at
  • Subject: [mg23780] Re: Levenberg-Marquardt ?
  • From: Rob Knapp <rknapp at>
  • Date: Sat, 10 Jun 2000 02:59:25 -0400 (EDT)
  • Organization: Wolfram Research, Inc.
  • References: <8hfddu$>
  • Sender: owner-wri-mathgroup at

Alastair McLean wrote:
> Has the Levenberg-Marquard method of non-linear least
> squares minimisation been implemented as a Mathematica
> function or package yet ?

This is implemented in FindMinimum.

If the objective function is structurally a sum of squares, it is
invoked automatically instead of the usual default method.  You can also
explicitly use the option Method->LevenbergMarquardt

One common use of this is through the package Statistics`NonlinearFit`
which uses this method to do a nonlinear data fit.

Rob Knapp
Wolfram Research

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