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- function lab4prob2
- X = [-1 0 1 2];
- Y = [2 1 2 11];
- mean(X)
- mean(Y)
- var(X)
- var(Y)
- cov_matrix = cov(X,Y)
- r = corrcoef(X,Y)
- r(1,2);
- plot(X,Y,'b*')
- hold on;
- p = polyfit(X,Y,2)
- p(1),p(2)
- a = min(X):0.01:max(X);
- b = p(1)*a.^2 + p(2)*a + p(3);
- plot(a,b,'r-');
- v =polyval(p, [2.5, 3])
- disp(v)
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