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Re: multifit non-linear least square fitting code
- From: Brian Gough <brian dot gough at network-theory dot co dot uk>
- To: "Klassen, Timothy" <Timothy dot Klassen at gs dot com>
- Cc: "'gsl-discuss at sources dot redhat dot com'" <gsl-discuss at sources dot redhat dot com>
- Date: Tue, 10 Dec 2002 11:10:12 +0000 (GMT)
- Subject: Re: multifit non-linear least square fitting code
- References: <A7E4D86FBB7BD51194AF0002A55C6AAC1658282D@gsny36e.ny.fw.gs.com>
Klassen, Timothy writes:
> In any case, i figured i'd try the gsl code in the multifit
> project. I used the MGH17 from the NIST site as an example;
> cf. attachment. I found that the gsl code does not converge to the
> right answer (even if started very close to the answer) whereas the
> NumRec code does (albeit slowly sometimes).
Check the sign of your derivatives.
Brian