untitled3.m

数学建模中回归法拟合（包括初步回归

A=[11 23 31 42 21 62 87 34 23 11 55 32;22 12 43 25 22 11 34 43 65 76 97 12;23 54 87 98 54 43 12 13 11 65 76 96]';
Y=[1 2 4 3 6 5 8 7 9 10 2 4];
x1=A(:,1);
x2=A(:,2);
x3=A(:,3);
x4=x1.*x2;
x5=x1.*x3;
x6=x2.*x3;
X=[A,x4,x5,x6];
stepwise(X,Y)