Solving nonlinear equations using Matlab

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!

[Steradiant]

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

[Xi]

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.

Answer 1

[Ameer Hamza]

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.