need help to plot smooth of 𝑦̂ the least-squares fit to the data, over the range of x-values
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function [coefficients, MSE] = pnnnfit(x, y, order)
coefficients = polyfit(x, y, order)
y_fitted = polyval(coefficients, x)
squaredError = (y - y_fitted) .^ 2
MSE = sum(squaredError)
plot(x, y,'o')
end
%x=[0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5];
% y=[0 -5.27 -8.10 -8.46 -6.38 -1.84 5.15 14.59 26.48 40.83 57.63];
Answers (1)
Ameer Hamza
on 2 Dec 2020
Edited: Ameer Hamza
on 2 Dec 2020
You are just plotting the actual points. The y_fitted will be smooth
x=[0 .5 1 1.5 2 2.5 3 3.5 4 4.5 5];
y=[0 -5.27 -8.10 -8.46 -6.38 -1.84 5.15 14.59 26.48 40.83 57.63];
pnnnfit(x, y, 2);
function [coefficients, MSE] = pnnnfit(x, y, order)
coefficients = polyfit(x, y, order)
y_fitted = polyval(coefficients, x)
squaredError = (y - y_fitted) .^ 2
MSE = sum(squaredError)
plot(x, y,'o')
hold on
plot(x, y_fitted)
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/439343/image.png)
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