This example computes all the eigenvalues of $Az=\lambda Bz$, where and using packed storage. Here $B$ is Hermitian positive definite and must first be factorized by zpptrf. The program calls zhpgst to reduce the problem to the standard form $Cy=\lambda y$; then zhptrd to reduce $C$ to tridiagonal form, and dsterf to compute the eigenvalues.