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Re: Troubles in NonlinearFit-Why always failed?

• To: mathgroup at smc.vnet.net
• Subject: [mg65982] Re: Troubles in NonlinearFit-Why always failed?
• From: "simon yang" <yanshanguke at 163.com>
• Date: Tue, 25 Apr 2006 05:19:19 -0400 (EDT)
• References: <e2fkib$blb$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

I have found the solutions.
The key lies here, the functions Gc[x] and L[x] used in Epsilon2[x]
was not be replaced by their definement.
If I replace the  Gc[x] and L[x] in Epsilon2[x] directly by their
definement, then NolinearRegress work.

So how to make sure functions were replaced by their definement when I
use them in other functions?

The NonlinearRegress use too much time though I had set the
MaxIterations to 10, about 1 hour, in mathematica!
But in other software developed by C language , 10 minutes just be used
though the function have hundreds of parameters.
How to make NonlinearFit in mathematica more quick?