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MathGroup Archive 2000

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Re: Fitting a function to a list (newbie)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21864] Re: Fitting a function to a list (newbie)
  • From: Harald Giese <giese at ifm.uni-hamburg.de>
  • Date: Wed, 2 Feb 2000 22:54:21 -0500 (EST)
  • Organization: Institut fuer Meereskunde, Universitaet Hamburg
  • References: <872jej$civ@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

mathprof at bigfoot.com wrote:
> 
> I'm new to Mathematica 4.0, so I apologize if this question is overly
> trivial (and please let me know if there's a place for trivial
> question).
> 
> I have a list that I'd like to fit to the function:
> 
> A + B*Sin[C*x+D]
> 
> In other words, I'd like to find the (approximate numeric) values of
> A,B,C,D that yield the best fit to my data.
> 
> I tried using Fit[], but it only applies to linear combinations of
> functions, and couldn't optomize the values of C and D.
> 
> For this specific problem, I'm guessing some sort of Fourier transform
> might work, but I'm interested in a more general solution -- for example
> if Sin[] were replaced with a more complicated function.
> 
> Any help appreciated!
> 

Hi "mathprof" (?!)

Have a look at the Mathematica standard package "NumericalMath`TrigFit`".

Regards,
/Harald


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