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Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? [message #52893 is a reply to message #52883]

Thu, 08 March 2007 01:53

Wox
Messages: 184
Registered: August 2006

Senior Member

On 07 Mar 2007 21:07:36 -0500, Craig Markwardt
<craigmnet@REMOVEcow.physics.wisc.edu> wrote:

<snip>
> CURVEFIT - poor man's non-linear least squares original to IDL, based
> on gradient expansion and not really robust.
<snip>

I always thought CURVEFIT was using Levenberg-Marquardt. Check the use
of lambda, which allows the alternation between gradient and expansion
method (which is the Levenberg-Marquardt as far as I know).

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[Message index]

		Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? By: Paul Van Delst[1] on Thu, 08 March 2007 07:53
		Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? By: Wox on Thu, 08 March 2007 01:53
		Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? By: Craig Markwardt on Wed, 07 March 2007 18:07
		Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? By: duxiyu@gmail.com on Wed, 07 March 2007 17:19
		Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? By: duxiyu@gmail.com on Wed, 07 March 2007 17:08
		Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? By: news.qwest.net on Wed, 07 March 2007 07:02
		Re: What is the difference between 'curvefit', 'lmfit' and 'svdfit' procudure? By: Craig Markwardt on Wed, 07 March 2007 06:20

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