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Re: Troubles in NonlinearFit-Why always failed?
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?