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RE: Problems with FindMinimum

  • To: mathgroup at
  • Subject: [mg90738] RE: Problems with FindMinimum
  • From: "Teodoro Marinucci" <teodorom at>
  • Date: Tue, 22 Jul 2008 03:57:11 -0400 (EDT)
  • References: <g5v5mf$ia9$> <>

Merci Jean-Marc,
unfortunately the exponential (Z0 in the following) is 3/2, not 2/3. 
When one is lucky ... because in the most general case the exponential 
is a real number (between 1 and 1.5).
The function I'm trying to fit with the experimental data (that are 
supplied in Vgk[[i]] and Vak[[i]])

G3_,mu0_,mu1_,mu2_,mu3_,H0_,H1_,H2_,H3_]:=(G0+G1 Vgk+G2 Vgk^2+G3 Vgk^3 
) (Vgk+Vak/(mu0+mu1 Vgk+mu2 Vgk^2+mu3 Vgk^3)+H0+H1 Vgk+H2 Vgk^2+H3 

It has a lot of parameters, I know, but usually


and so on, so I could, in principle, attempt a perturbative approach. 
Unfortunately I get the same error even if I start from a enough good 
solution (enough near fit).
Thanks again
		Teodoro Marinucci

-----Original Message-----
From: Jean-Marc Gulliet [mailto:jeanmarc.gulliet at]
Sent: domenica 20 luglio 2008 19.11
To: teodorom at; mathgroup at
Subject: [mg90738] Re: Problems with FindMinimum

teodorom at wrote:

> I'm having problems with the FindMinimum.
> I'm currently getting errors like this:
> FindMinimum::nrlnum: The function value {0.335521+43899.8 \
> [ImaginaryI],0.376043+43899.8 \[ImaginaryI],0.424669+43899.8 \
> [ImaginaryI],<<6>>,0.311208+46311.9 \[ImaginaryI],<<27>>} is not a
> list of real numbers with dimensions {37} at {x0,y0,x1,y1,hh0,hh1} 

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