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

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Ali
Ali 2016-3-19
编辑： Ali 2017-1-20
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 ]
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Walter Roberson
Walter Roberson 2016-3-20
The question appears to be incomplete. It appears to be a copy and paste of an assignment but with a formula skipped.

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Star Strider
Star Strider 2016-3-19
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
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Star Strider
Star Strider 2016-3-26
With respect to your re-titled Question: ‘what is different between while and for in matlab’:
A for loop sets a specific number of iterations at the outset:
for k1 = 1:10
... CODE ...
end
will run the code in the loop 10 times.
A while loop runs until a specific condition within the loop is met:
while q < 10
q = ...;
end
will run as many iterations as necessary until, in this example, ‘q’ is greater than or equal to 10, then the loop stops.

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