The DS package provides auxiliary routines that are internally used by the different SLEPc solvers. It is used to represent low-dimensional eigenproblems that must be solved within iterative solvers with direct methods. It can be seen as a structured wrapper to LAPACK functionality.
These routines are usually not needed by application programmers.
hep/
nhep/
ghep/
ghiep/
gnhep/
nhepts/
svd/
gsvd/
hsvd/
pep/
nep/
dsutil.c