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**LA_SBGVX** and **LA_HBGVX** compute selected eigenvalues and,
optionally, the corresponding
eigenvectors of the generalized eigenvalue problem

where and are real symmetric in the case of **LA_SBGVX**
and complex Hermitian in the case of **LA_HBGVX**.
In both cases is positive definite. Matrices and
are stored in a band format. Eigenvalues and eigenvectors
can be selected by specifying either a range of
values or a range of indices for the desired eigenvalues.

Susan Blackford
2001-08-19