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Re: mpfit: multivariate fit [message #54126 is a reply to message #54032]

Sun, 20 May 2007 20:25

Richard French
Messages: 173
Registered: December 2000

Senior Member

On the subject of MPFIT, I'm trying to implement the '(EXTERNAL)' function
option (the case where the user does not supply a function to be called by
MPFIT itself, but is expected to supply function values and a jacobian
matrix in each call to MPFIT). I'm trying to do this with a very simple
polynomial function for which the partial derivatives are very easy to
compute, but the fitted parameters are not the correct values, the number of
degrees of freedom returned is a negative number, and in general I am
clearly not getting things to work.

In trying to debug this, I found what looks like an undocumented keyword:
EXTERNAL_INIT whose purpose is a bit obscure to me. I tried fiddling with
this but it did not fix the problem

Does anyone (Craig or someone else) have a simple example of MPFIT that uses
the EXTERNAL option? If so, I'd be grateful if you would send it along. If
not, then I can post my failing example so that someone can tell me what I
am doing wrong.

Thanks very much.

Dick French
rfrench@REMOVEwellesley.edu

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[Message index]

		mpfit: multivariate fit By: Dave[3] on Mon, 07 May 2007 21:19
		Re: mpfit: multivariate fit By: Vince Hradil on Fri, 11 May 2007 06:45
		Re: mpfit: multivariate fit By: Vince Hradil on Fri, 11 May 2007 06:44
		Re: mpfit: multivariate fit By: Craig Markwardt on Sat, 12 May 2007 17:00
		Re: mpfit: multivariate fit By: Richard French on Sun, 20 May 2007 20:25
		Re: mpfit: multivariate fit By: Richard French on Mon, 21 May 2007 16:52
		Re: mpfit: multivariate fit By: Craig Markwardt on Sun, 20 May 2007 23:13

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