Fitting experimental data to find a function

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

 采纳的回答

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.

2 个评论

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
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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