Troubleshooting - A Guide to MATLAB for Beginners and Experienced Users - page 260

ans =
0

The matrix A2 does not have an inverse.

det(A3)
inv(A3)

ans =
294
ans =
0.1837 -0.1531 -0.2857 -0.3163

0.0000 0.1667 -0.0000 0.1667

0.1633 0.0306 -0.1429 -0.3367

0.2857 -0.0714 0 -0.2143

det(A4)
inv(A4)

ans =
a*d-c*b
ans =
[ d/(a*d-c*b), -b/(a*d-c*b)]
[ -c/(a*d-c*b), a/(a*d-c*b)]

Problem 12

(a)

[U1, R1] = eig(A1)

U1 =
-0.9749 0.6036 0.6036

-0.2003 0.0624 + 0.5401i 0.0624 - 0.5401i

0.0977 -0.5522 + 0.1877i -0.5522 - 0.1877i

R1 =
3.3206

0 0

0 -1.1603 + 5.1342i 0

0 0 -1.1603 - 5.1342i