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**LA_SBGV**, **LA_SBGVD**, **LA_HBGV** and **LA_HBGVD** compute all
eigenvalues and, optionally, all eigenvectors of the generalized
eigenvalue problem

where and are real symmetric in the cases of **LA_SBGV**
and **LA_SBGVD** and complex Hermitian in the cases of **LA_HBGV**
and **LA_HBGVD**. Matrix is positive definite. Matrices and
are stored in a band format.

**LA_SBGVD** and **LA_HBGVD** use a divide and conquer algorithm.
If eigenvectors are desired, they can be much faster than
**LA_SBGV** and **LA_HBGV** for large matrices but use more workspace.

Susan Blackford
2001-08-19