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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98365] Re: Does FindFit really use Norm[] when NormFunction -> Norm?
  • From: Szabolcs HorvÃt <szhorvat at gmail.com>
  • Date: Wed, 8 Apr 2009 02:45:28 -0400 (EDT)
  • References: <34b6e3d4-6741-4ee7-8b1f-12e6fcadd2a5@z14g2000yqa.googlegroups.com>

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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