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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: [mg21863] Re: Fitting a function to a list (newbie)
  • From: "Robert Nowak" <robert.nowak at ims.co.at>
  • Date: Wed, 2 Feb 2000 22:54:20 -0500 (EST)
  • Organization: telecom.at (Vienna, Austria)
  • References: <872jej$civ@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
what you need is:

<< Statistics`NonlinearFit`
NonlinearFit[data, A + B*Sin[C*x+D], x, {A,B,C,D}]


--
---
Robert Nowak (robert.nowak at ims.co.at)
Ionen Mikrofabrikations Systeme GmbH
A-1020 Wien, Schreygasse 3, Austria
Phone: (+43 1)2144894-32, Fax: (+43 1)2144894-99

<mathprof at bigfoot.com> wrote in message news:872jej$civ at smc.vnet.net...
> 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!
>
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
>




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