Anyone have any clue about nonlinear curve fitting. I'm trying to implement
the Levenberg-Marquardt method in C++ from Numerical Recipes in C. I have it
running, but it doesn't do as well a job as commercial software. Can someone
suggest any tweaks to this method to make it better or maybe a totally
different method. By the way, I'm trying to fit this equation: a +
.5*b*{1+erf[(x-c)/(d*sqrt(2)]}
Thanks,
Robert
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