Fitting experimental data to find a function

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Anoire BEN JDIDIA 2016-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/307818-fitting-experimental-data-to-find-a-function

评论： Gareth Lee 2016-10-18

采纳的回答： Gareth Lee

I have an experimental data I=f(t) and I want to find the equation of This trend.

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Answer 1

Gareth Lee 2016-10-18

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https://ww2.mathworks.cn/matlabcentral/answers/307818-fitting-experimental-data-to-find-a-function#answer_239513

You can try polyfit function or other curve fit function, i.e. nlinfit or lsqcurvefit,to find proper equation. you also use cftool to curve or regress your data.

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Anoire BEN JDIDIA 2016-10-18

I'm currently testing curve fitting toolbox but how can I know which is the best regression. Ps: in my case is a non linear regression

Gareth Lee 2016-10-18

This is a complicate problem, it is hard to say which method is good. you only try it, and judge it with some mathematical index. I suggest that plot it firstly, and estimate the equation according to curve. try it, and obtain some good parameters.

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