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  • To: mathgroup at
  • Subject: [mg43422] nonlinearfit
  • From: Ming Hsu <mhsu at>
  • Date: Tue, 16 Sep 2003 04:36:46 -0400 (EDT)
  • Organization: California Institute of Technology, Pasadena
  • Sender: owner-wri-mathgroup at

Hi, I believe this question was posted before, but I couldn't find any
followups with the answer.  I have a messy nonlinear regression where I
want to constrain a subset of the parameter values to be positive.  

The general problem is that there is some software slowdown problems that
I want to take account of.  I am adding a Exp[a*(t-1)] term to the
model (which is nonlinear anyways).  So I want to make sure that a>=0.  

I understand that nonlinearfit is based on findminimum, which I know has
that capability, but it doesn't seem to be an option for nonlinearfit. 


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