Matrices for Engineers

7.10: EIGENVECTORS FOR COMPLEX EIGENVALUES

7.10 EIGENVECTORS FOR COMPLEX EIGENVALUES

If complex eigenvalues occur, they must occur in complex conjugate pairs. The procedure for finding the eigenvectors follows that of Sections 7.8 and 7.9.

Example 7.10

The matrix


has a characteristic matrix


and a characteristic polynomial


The three eigenvalues are


The eigenvectors are obtained by putting each eigenvalue in turn into


For ? 1 = ?1


This can be expanded to yield the linearly independent system


and the solution here is


and


Thus, with an arbitrary selection of x 2 = 1, the first eigenvector is


For ? 2 = ?1 + i2,


and when this matrix representation is expanded it is observed that


Here


and


so that with the arbitrary selection of x 2 = 5, the second eigenvector is


Finally, for ?3 = ?1 ? i2


or in expanded form


Here


and


so that with the arbitrary selection of x 2 = 5, the third eigenvector becomes


The reader may verify that the three eigenvectors form a linearly independent set.

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