Fitting the curve problem

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Yumeng Yin 2022-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/1662235-fitting-the-curve-problem

编辑： Yumeng Yin 2022-3-10

I try to fit an s-shape curve with the function that I define. But I only got a bad fit with the constant. Attached file is the data file and my scripts. Any advice will be appreciated.

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Image Analyst 2022-3-3

For our convenience can you attach a screenshot of the data plotted?

Yumeng Yin 2022-3-3

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回答（1 个）

David Hill 2022-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/1662235-fitting-the-curve-problem#answer_908285

在 MATLAB Online 中打开

[fitcurve,gof]=fit(duration_fit,y_duration_fit,'fourier5');%fourier5 does not look too bad

Thanks a lot, David. That is another new idea for me to think about. But I need to use my own defined equation to fit it so that I could extract the parameter that I define. I am wondering if my setting is not complete and it leads to a bad fitting to my equation.

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