Curve fitting real functions

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wallflower
wallflower 2020-12-10
评论： wallflower 2021-1-4
When doing my research to see how are real functions fitted in MATLAB, no answer has been found. Only the fitting of complex functions is proposed. Why is that?
Thanks in advance :^)
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riccardo
riccardo 2020-12-10
The curve fitting tool seems to have the rational function as an option.
Alternatively, you could always revert to using "fzero" or "fminsearch", by converting your problem to minimising the residuals of:
<YourFunctionR>(f) * <denominator polynomial> - <numerator polynomial> = 0

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Steven Lord
Steven Lord 2020-12-10
There is a collection of library models that can be used with functionality in Curve Fitting Toolbox. One type of model included in that collection is 'rational', which contains polynomials of degree up to 5 for both the numerator and denominator. If that's not sufficient, you can also create your own custom model.

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