1. >> x=[1 -1 -1 ;1 -1 -1 ;1 -1 -1 ;1 1 -1 ;1 1 -1 ;1 1 -1 ;1 -1 1 ;1 -1 1 ;1 -1 1 ;1 1 1 ;1 1 1 ;1 1 1 ;1 0 0 ;1 0 0 ;1 0
0 ;1 0 0 ;1 0 0]
x=
1 -1 -1
1 -1 -1
1 -1 -1
1
1 -1
1
1 -1
1
1 -1
1 -1
1
1 -1
1
1 -1
1
1
1
1
1
1
1
1
1
1
1
0
0
1
0
0
1
0
0
1
0
0
1
0
0
>> y=[6.4 ;6.2 ;5.5 ;5.7 ;4.6 ;4.9 ;6.6 ;6.6 ;5.8 ;7.1 ;6.6 ;7.7 ;4.8 ;5.1 ;5.0 ;5.4 ;4.9 ]
y=

2. 6.4000
6.2000
5.5000
5.7000
4.6000
4.9000
6.6000
6.6000
5.8000
7.1000
6.6000
7.7000
4.8000
5.1000
5.0000
5.4000
4.9000
>> x'*x
ans =
17
0
0
0 12
0

3. 0
0 12
>> inv(x'*x)
ans =
0.0588
0
0
0 0.0833
0
0
0 0.0833
>> x'*y
ans =
98.9000
-0.5000
7.1000
>> b=(inv(x'*x))*((x'*y))
b=
5.8176
-0.0417
0.5917

4. >> ezsurf('5.8176-(0.0417*x1)+(0.5917*x2)')
>> ezmesh('5.8176-(0.0417*x1)+(0.5917*x2)')
>> ezcontour('5.8176-(0.0417*x1)+(0.5917*x2)')
>> ezmeshc('5.8176-(0.0417*x1)+(0.5917*x2)')
>> ezsurfc('5.8176-(0.0417*x1)+(0.5917*x2)')