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Re: Does FindFit really use Norm[] when NormFunction -> Norm?


2009/4/6 Darren Glosemeyer <darreng at wolfram.com>:
>
> This has been pointed out to the developer for further consideration.
>
> What's happening now is that Norm is getting caught and the internal code
> uses default code (mathematically equivalent nonlinear least squares
> optimization code) which runs into some complexes in intermediate
> calculations. The Abs@Norm or myNorm NormFunction settings do not get caught
> and the complexes are not encountered.
>

Thanks for the reply!  If it is not actually using Norm internally,
then perhaps a default setting of NormFunction -> Automatic or
something similar would be less confusing.

Szabolcs


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