Fitting the curve problem

2022 3 2
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更新时间：2022 3 10
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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
Image Analyst 2022-3-3
For our convenience can you attach a screenshot of the data plotted?

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David Hill
David Hill 2022-3-2

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

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Yumeng Yin
Yumeng Yin 2022-3-3
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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