Question

用matlab求解多元线性方程拟合

例如：x1=[1,1,2,2,0,4,2];
x2=[1,2,1,3,3,4,0];
x3=[1,2,2,3,0,4,3];
y=[4,8,7,12,7,18,6];
y=a*x1+b*x2+c*x3+d,如何用matlab拟合求出a,b,c,d的值，卖身求解

Answer 1

>> y=[4,8,7,12,7,18,6]';
x1=[1,1,2,2,0,4,2]';
x2=[1,2,1,3,3,4,0]';
x3=[1,2,2,3,0,4,3]';
X=[x1 x2 x3 ones(size(y))];
B=regress(y,X)

B =

1.1212
2.1970
1.1364
0.1061

>> a=B(1)

a =

1.1212

>> b=B(2)

b =

2.1970

>>