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我有一個獨立變量回歸的matlab代碼，但如果我有兩個獨立變量（x1和x2）呢？我應該如何修改這個多項式迴歸的代碼？迴歸在matlab
x = linspace(0,10,200)'; % independent variable
y = x + 1.5*sin(x) + randn(size(x,1),1); % dependent variable
A = [x.^0, x]; % construct a matrix of permutations
w = (A'*A)\(A'*y); % solve the normal equation
y2 = A*w; % restore the dependent variable
r = y-y1; % find the vector of regression residual
plot(x, [y y2]);