I know this question have been extensively asked previously,
However, I want to fit an exponontial equation y = a*(1-b*exp(-c*x)) where a,b and c are constants to be optimized, y and x are experimental data obtained as follows
xx=[0.001,5,10,20,40,80];
yy=[0,5,8,11.2,18.3,25.3];
From previous threads I read in the fourm, I ended up forming the below function:
function x = material(y)
xx=[0.001,5,10,20,40,80];
yy=[0,5,8,11.2,18.3,25.3];
a=y(1); b=y(2); c=y(3);
for j=1:6
x=(a)*(1-b*exp(-c*xx(j)))-yy(j);
end
end
I used the function above with GA toolbox in MATLAB 2017b, the results are way wrong
49.98723904071618 49.939937193013776 0.011881054853272788 for a,b and c respictevely
what i have missed?
Thanks for your help!
