用MATLAB软件使用最小二乘法对数据进行处理。急急急~~~

Question

1. 设三只被测电阻分别为x1,x2,x3。先用普通万用表测得组合量值记入下表：
组合量 X1 X2 X3 X1+X2 X2+X3 X1+X2+X3
测得值 0.052 0.552 0.116 0.604 0.668 0.720
2. 用最小二乘法求各电阻测量的估计值及其精度，用MATLAB编写代码进行处理。
需要把整个代码以及运算结果发过来，万分感谢！！！

Answer 1

Y=[0.052 0.552 0.116 0.604 0.668 0.720]';
x=[1 0 0
0 1 0
0 0 1
1 1 0
0 1 1
1 1 1];
[X,XINT,R,RINT,STATS]=regress(Y,x)
rcoplot(R,RINT)
Warning: R-square and the F statistic are not well-defined unless X
has a column of ones.
Type "help regress" for more information.
> In regress at 162

X =

0.0520
0.5520
0.1160

XINT =

0.0520 0.0520
0.5520 0.5520
0.1160 0.1160

R =

1.0e-015 *

0.0278
0
0.0694
0
0.1110
0

RINT =

1.0e-015 *

-0.1758 0.2313
-0.2130 0.2130
-0.0754 0.2142
-0.2130 0.2130
0.1110 0.1110
-0.2130 0.2130

STATS =

1.0e+031 *

0.0000 3.5549 0.0000 0.0000