ZHBEVX Example

To find the eigenvalues in the half-open interval $\left(\vphantom{-2, 2}\right.$ -2, 2$\left.\vphantom{-2, 2}\right]$, and the corresponding eigenvectors, of the Hermitian band matrix

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

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