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Re: [Help-gsl] non-linear least squares fitting

From: Joakim Hove
Subject: Re: [Help-gsl] non-linear least squares fitting
Date: Fri, 08 Apr 2005 12:44:51 +0200
User-agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.2 (gnu/linux)

These ideas are all untested

I would recomend creating struct containing the relevant flags and
default values, and then pass a pointer to such an instance as the
void parameter in the fitting routines - that way you avoid the global

To ensure[1] that the parameters are not changed I would set the 
jacobian for those parameters which should be fixed forcibly to zero.

[1]: I don't know the details of the algorithm, this might not be
     sufficient; and it is probably *not* optimal.

> PS. The manual text on the non-linear least squares fitting follows from the
> section on multidimensional minimization.  But in this case, I find the
> notion of parameters and x values to be backwards. Most would expect "x" to
> be the name of the data point, and not the parameter to be minimized.  

I fully agree :-)

HTH - Joakim

Joakim Hove
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