DSBEVX Example

To find the eigenvalues in the half-open interval $\left(\vphantom{-3, 3}\right.$ -3, 3$\left.\vphantom{-3, 3}\right]$, and the corresponding eigenvectors, of the symmetric band matrix

A = $$\left(\vphantom{ \begin{array}{rrrrr} 1 & 2 & 3 & 0 & 0 \\ 2... ...3 & 4 & 5 \\ 0 & 4 & 4 & 4 & 5 \\ 0 & 0 & 5 & 5 & 5 \end{array} }\right.$$$$\begin{array}{rrrrr} 1 & 2 & 3 & 0 & 0 \\ 2 & 2 & 3 & 4 & 0 \... ... 3 & 3 & 3 & 4 & 5 \\ 0 & 4 & 4 & 4 & 5 \\ 0 & 0 & 5 & 5 & 5 \end{array}$$$$\left.\vphantom{ \begin{array}{rrrrr} 1 & 2 & 3 & 0 & 0 \\ 2... ...3 & 4 & 5 \\ 0 & 4 & 4 & 4 & 5 \\ 0 & 0 & 5 & 5 & 5 \end{array} }\right)$$.

Example program
Example data
Example results