HP MLIB User's Guide Vol. 2 7th Ed.

1014 HP MLIB User’s Guide
What you need to know to use these subprograms
Figure 15-4 Paths of Control(continued)
To use the general interface, the user must call a sequence of subprograms that
perform the following operations:
• Initialization
• Input of matrix structure
• Reordering
• Input of values of matrix entries
• Eigenextraction
• Retrieval of eigenvalues and vectors
It is possible to use this package to solve several different eigenvalue problems
associated with the same matrix. This uncommon situation can be handled by
calling the eigenextraction subprogram with different specifications for the
desired eigenvalues. The only mechanism for solving eigenvalue problems for a
sequence of matrices with different values, but the same sparsity pattern, is to
use the save and restart facilities immediately after the reordering phase.
DSEVCK
Utilities:
DSEVDA
DSEVSV
DSEVPS
DSEVOC
DSEVRS