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MathGroup Archive 1998

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Re: What is the fastest machine for Mathematica?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13664] Re: What is the fastest machine for Mathematica?
  • From: "Kenneth R. Foster" <kfoster at eniac.seas.upenn.edu>
  • Date: Mon, 10 Aug 1998 20:58:33 -0400
  • Organization: University of Pennsylvania
  • References: <6q3qkj$f19@smc.vnet.net> <6qboem$a1a@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

The problem in this case may be associated with the ill-conditioned
nature of this problem. Gaussians are not orthogonal functions, and the
program may be floundering among several sets of parameter values, all
of which provide almost equally good fit.

Paul Abbott wrote:

> Christian Keysers wrote:
>
> > The calculations involve fitting of gaussians to data set, and take
> > two long at present (2h30min for each data set requiring 16 * 8 fits).
>
> This seems pretty slow.  Instead of a faster machine I would recommend
> optimizing the computation.  Perhaps you could post a sample dataset
> and the sort of fit you are attempting?

--
Kenneth R Foster
Department of Bioengineering
University of Pennsylvania
220 S. 33rd St.
Philadelphia PA 19104-6392
215-898-8534
fax 215-573-2071
President IEEE Society on Social Implications of Technology 1997-8
Chair, EMBS Committee on Man and Radiation 1997-
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http://homepage.seas.upenn.edu/~kfoster/papers.htm



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