Solving nonlinear equations using Matlab

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Xi 2020-6-4

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回答： RENEE HENIN 2025-3-21

采纳的回答： Ameer Hamza

Hi,

I have a function as y=f(x1,x2...xN) which contains N unknows. This equation is pretty complex and contains integral and exponential terms. Fortunately, I also have N curves and all of them can be fitted by this function with the same N variables. So is there any way using matlab to solve this equation? Thanks!

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Steradiant 2020-6-4

Have you already had a look into the fsolve()-function?

Xi 2020-6-4

Well, fsolve can solve the equation but what I need is a fitting. Note that each curve has many points so a least-square solving is needed.

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Ameer Hamza 2020-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/542123-solving-nonlinear-equations-using-matlab#answer_446228

See lsqcurvefit(): https://www.mathworks.com/help/releases/R2020a/optim/ug/lsqcurvefit.html from optimization toolbox or fit(): https://www.mathworks.com/help/releases/R2020a/curvefit/fit.html from curve-fitting toolbox.

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RENEE HENIN 2025-3-21

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yujhg

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