HP 49g+ - Manual (Page 368)

Page 11-46
Change mode to Approx and repeat the entry, to get the following
eigenvalues:
[(1.38,2.22), (1.38,-2.22), (-1.76,0)].
Function EGV
Function EGV (EiGenValues and eigenvectors) produces the eigenvalues and
eigenvectors of a square matrix. The eigenvectors are returned as the
columns of a matrix, while the corresponding eigenvalues are the components
of a vector.
For example, in ALG mode, the eigenvectors and eigenvalues of the matrix
listed below are found by applying function EGV:
The result shows the eigenvalues as the columns of the matrix in the result list.
To see the eigenvalues we can use: GET(ANS(1),2), i.e., get the second
element in the list in the previous result. The eigenvalues are:
In summary,
λ
1
= 0.29, x
1
= [ 1.00,0.79,–0.91] T ,
λ
2
= 3.16, x
2
= [1.00,-0.51, 0.65] T ,
λ
3
= 7.54, x
1
= [-0.03, 1.00, 0.84] T .
Note: A symmetric matrix produces all real eigenvalues, and its eigenvectors
are mutually perpendicular. For the example just worked out, you can check
that
x
1
• x
2
= 0, x
1
• x
3
= 0, and x
2
• x
3
= 0.