Curve fit such as f(x) = A + B/x^2

Hi, my problem is that I need fit curve such as f(x) = A + B/x^2 in matlab any suggestions?

thanks

Answer 1

[Ameer Hamza]

If you have optimization toolbox then you can use lsqcurvefit()

x; % x-values
y; % f(x) values

mdl = @(p, x) p(1) + p(2)./x.^2;
sol = lsqcurvefit(mdl, rand(1,2), x, y);
A = sol(1);
B = sol(2);

You can also check fit() from Curve fitting toolbox.

[Peter Burda]

thanks mate but what does mean rand(1,2)?

[Ameer Hamza]

It is just a starting point for the algorithm.

Answer 2

[Matt J]

p=polyfit(1./x.^2,y,1);
B=p(1);
A=p(2);

Answer 3

[Matt J]

p=((1./x(:)).^[0,2]) \ y(:);
A=p(1);
B=p(2);