Hi, anybody can help me to check for question b whether my answer is correct or not? Thanks.

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Erwin Koman
Erwin Koman 2015-7-12
回答： Image Analyst 2015-7-12
Here is my code:
t = [0:19];
y = [6,13,23,33,54,83,118,156,210,282,...
350,440,557,685,815,990,1170,1350,1575,1830];
length (y)
Yy=-316.66;
d=y-Yy;
figure(2), bar(t,d)
r2=1-sum(d.^2)/sum((y-mean(y)).^2)

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回答（2 个）

Image Analyst
Image Analyst 2015-7-12
My demo on polyfit is attached. It fits a line and a cubic. Adapt as needed for your problem.
Image Analyst
Image Analyst 2015-7-12
For example:
coefficients = polyfit(t, y, 2);
fprintf('The equation is y = %f*t^2 + %f*t + %f\n',...
coefficients(1), coefficients(2), coefficients(3));
yfitted = polyval(coefficients, t);
sumOfResiduals = sum(............. you finish it.

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