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MathGroup Archive 2004

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Re: NonlinearFit

  • To: mathgroup at
  • Subject: [mg49874] Re: NonlinearFit
  • From: "Curt Fischer" <crf3 at>
  • Date: Thu, 5 Aug 2004 09:20:35 -0400 (EDT)
  • References: <ceqtcr$jrp$>
  • Sender: owner-wri-mathgroup at


Can you email me the files you tried to attach to your newsgroup message?


Andrew_Pollock at wrote:
> Hello,
> I was hoping someone could help me with a problem I'm having with
> NonlinearFit.
> I'm trying to fit an exponential function to a set of data using the
> following command:
> << Statistics`NonlinearFit`
> NonlinearFit[Data,theta1 Exp[theta2 x],x,{theta1,theta2}]
> Data is the following table, where the right column is 3*Exp[.2*x]
> (Embedded image moved to file: pic13984.pcx)
> [contact the author to get the file - moderator]
> NonlinearFit returns (Embedded image moved to file: pic03027.pcx),
> which is clearly not 3*Exp[.2*x].
> I only have this problem when trying to fit exponential functions. 
> Any suggestions?
> Thanks,
> Andy

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