fitting a polynomial function to data points and ploting it

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som
som 2011-11-7
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

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Richard Willey
Richard Willey 2011-11-7
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)

更多回答（1 个）

Pawel Blaszczyk
Pawel Blaszczyk 2011-11-7
doc polyfit
doc polyval
I think this two function will be enoguh :)

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