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MathGroup Archive 2005

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NonLinearRegress and constraint parameters

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57148] NonLinearRegress and constraint parameters
  • From: frank at kuesterei.ch (Frank Küster)
  • Date: Thu, 19 May 2005 03:08:16 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

I have been using Mathematica for a short while, and one application is
curve fitting to a set of measured data.  However, I have one problem
with this.  If I want to describe my data by a function model[x_] with
parameters a, b, c,.., how can I constrain the parameters to certain
ranges?

I came across a case where the function model[x_] is not defined (or
yields complex values) with certain combinations of parameters a,b,c,..
However, much more important would be cases where the function is well
defined (and might fit the data well), but the resulting values for the
parameters are unphysical.  I'd like NonLinearRegress to keep the
parameters in the "allowed" region (and rather give a bad or no fit,
indicating my model is wrong).  How can I accomplish this?

Thanks in advance, Frank
-- 
Frank Küster
Inst. f. Biochemie der Univ. Zürich
Debian Developer


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