EPSKrylovSchurGetKSP#

Retrieve the linear solver object associated with the internal EPS object in case of doing spectrum slicing for a computational interval.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSKrylovSchurGetKSP(EPS eps,KSP *ksp)

Collective

Input Parameter#

eps - the linear eigensolver context

Output Parameter#

ksp - the internal KSP object

Notes#

When invoked to compute all eigenvalues in an interval with spectrum slicing, EPSKRYLOVSCHUR creates another EPS object internally that is used to compute eigenvalues by chunks near selected shifts. This function allows access to the KSP object associated to this internal EPS object.

This function is only available for spectrum slicing runs, that is, when an interval has been given with EPSSetInterval() and STSINVERT is set. See more details in section Spectrum Slicing.

In case of having more than one partition, the returned KSP will be different in MPI processes belonging to different partitions. Hence, if required, EPSKrylovSchurSetPartitions() must be called BEFORE this function.