need help to plot smooth of 𝑦̂ the least-squares fit to the data, over the range of x-values

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Ahmed 2020-12-2

0
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https://ww2.mathworks.cn/matlabcentral/answers/673153-need-help-to-plot-smooth-of-the-least-squares-fit-to-the-data-over-the-range-of-x-values

编辑： Ameer Hamza 2020-12-2

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')
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];

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KSSV 2020-12-2

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Answer 1

Ameer Hamza 2020-12-2

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/673153-need-help-to-plot-smooth-of-the-least-squares-fit-to-the-data-over-the-range-of-x-values#answer_562468

编辑：Ameer Hamza 2020-12-2

在 MATLAB Online 中打开

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