MATLAB: The least squares quadratic function is given as Code a Matlab program

Question

The following data are given as the results of an experiment. The least squares quadratic function is given as Code a Matlab program that calculates the total squared error (E).

x = [5.435   4.635   3.835   3.035   2.325   1.435   0.635]
y = [1.00     1.28     1.70     2.20     2.97     4.35     7.50  ]

Answer 1

I’m not certain what you want to do.

Here is one possibility:

x = [5.435   4.635   3.835   3.035   2.325   1.435   0.635];
y = [1.00     1.28     1.70     2.20     2.97     4.35     7.50  ];
p = polyfit(x, y, 2);                                               % Quadratic Function Fit
v = polyval(p, x);                                                  % Evaluate
TSE = sum((v - y).^2);                                              % Total Squared Error
figure(1)
plot(x, y, 'bp')
hold on
plot(x, v, '-r')
hold off
grid