Non linear Fitting using a Rational Function
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Hello,
I have some experimental data and I am trying to fit this data with a rational function, i.e. in the numerator there is a quadratic polynomial function and in the denominator there is a 4th degree polynomial function.
I am using the Levenberg-Marquardt to do the fit and the MatLab can not fit when I put my equation in the "Custom Equations" in the ToolBox Curve Fitting.
The rational function was derived from the combination of three ODE, these equations describe the physical phenomenon.
Can I need to put the equations and the experimental data here?
Thank you very much,
Eduardo
2 Comments
Matt J
on 29 Sep 2012
Elaborate on "Matlab can not fit...".
Do you mean that it gives you an error message when you try? Or, do you just mean that it returns a bad fit?
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