A=[1 4 3 2;1 -1 -2 0;2 9 5 2;2 7 7 6]
A =
1 4 3 2
1 -1 -2 0
2 9 5 2
2 7 7 6
>> B=[1;2;4;0]
B =
1
2
4
0
>> det(A)
ans =
0
>> A=[1 4 3 2;1 -1 -2 3;2 9 5 2;2 7 7 6]
A =
1 4 3 2
1 -1 -2 3
2 9 5 2
2 7 7 6
>> det(A)
ans =
0
>> A=[1 4 3 2;1 -1 -2 3;2 9 5 2;2 7 0 6]
A =
1 4 3 2
1 -1 -2 3
2 9 5 2
2 7 0 6
>> det(A)
ans =
63
>> X=A\B
X =
5.2222
-0.4444
0
-1.2222
>> A*X
ans =
1
2
4
0
>> inv(A)
ans =
-0.8730 1.1111 0.9683 -0.5873
-0.2540 -0.2222 0.0635 0.1746
0.5714 0.0000 -0.1429 -0.1429
0.5873 -0.1111 -0.3968 0.1587
>> inv(A)*B
ans =
5.2222
-0.4444
0.0000
-1.2222
>> A*(inv(A)*B)
ans =
1.0000
2.0000
4.0000
0
>> A=(1:2,2:4)=0
??? A=(1:2,2:4)=0
|
Error: ")" expected, "," found.
>> A(1:2,2:4)=0
A =
1 0 0 0
1 0 0 0
2 9 5 2
2 7 0 6
>> A=[1 4 3 2;1 -1 -2 3;2 9 5 2;2 7 0 6]
A =
1 4 3 2
1 -1 -2 3
2 9 5 2
2 7 0 6
>> F1=inv(A)
F1 =
-0.8730 1.1111 0.9683 -0.5873
-0.2540 -0.2222 0.0635 0.1746
0.5714 0.0000 -0.1429 -0.1429
0.5873 -0.1111 -0.3968 0.1587
>> F2=eye(4)
F2 =
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
>> F1&F2
ans =
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
>> F1|F2
ans =
1 1 1 1
1 1 1 1
1 1 1 1
1 1 1 1
>> F1~=F2
ans =
1 1 1 1
1 1 1 1
1 1 1 1
1 1 1 1
>> F1==F2
ans =
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
>> F1=inv(A)*A
F1 =
1.0000 0 0 -0.0000
0 1.0000 -0.0000 0
0 0 1.0000 0
0 0 0 1.0000
>> F2=eye(4)
F2 =
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1
>> F1|F2
ans =
1 0 0 1
0 1 1 0
0 0 1 0
0 0 0 1