How to do curve fitting in my situation

    function specialcurve = MagCurv(Js,H0,A,H1,H2,n,B,H3,H4)
             specialcurve = @mfunc;
             function J = mfunc(H)
                J = Js*atan(H./H0)*2/pi.*(1-A*exp(-((H+H1)/H2).^n)).*(1-B*exp(-((log(H+eps)-...
                     log(H3))/log(H4)).^2));
             end
     end

Now I have raw data of H and J (array 1*23) and I want to get parameters(Js,H0,A,H1,H2,n,B,H3,H4) through curve fitting. Is that possible?

Thanks a lot!

Answer 1

[Matt J]

LSQCURVEFIT, if you have it, would be applicable.

[Yizhi]

Thanks for replying! But how? I have my main function only delivering a handle of sub function and I have rawdata of H and J, both of them are array and used in sub function. But I need to get Js,H0,A,H1,H2,n,B,H3,H4 in the main function through curve fitting

[Yizhi]

I mean using of lsqcurvefit is that the function have a format of

J = myfunc(x,H)

where H and J is known and you use lsqcurvefit to get x

[Matt J]

Combine your unknowns into a single vector

 x=[Js,H0,A,H1,H2,n,B,H3,H4]

and similarly with your data