MATLAB: Fitting a polynomial function to data points and ploting it

curve fitting

Hi all
I want to fit a quadratic function to a data serie in MATLAB and calculate determination coefficient (R2) as well as quadratic equation.so desired outputs are as below: – scatter plot of data serie i.e. (x, y) – plot of quadratic fitting – quadratic equation – determination coefficient (R2) Could you please guide me. thanks

Best Answer

If you have Curve Fitting Toolbox, you can generate everything you need as follows
X = 1:100;
X = X';
Y = X.^2 + 3*X + 5 + randn(100,1);
[foo Gof] = fit(X,Y, 'poly2')
scatter(X,Y)
hold on
plot(foo)
Related Question