slepc-3.21.1 2024-04-26
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EPSJDGetInitialSize

Returns the initial size of the searching space.

Synopsis

#include "slepceps.h" 
PetscErrorCode EPSJDGetInitialSize(EPS eps,PetscInt *initialsize)
Not Collective

Input Parameter

eps  - the eigenproblem solver context

Output Parameter

initialsize  - number of vectors of the initial searching subspace

Notes

If EPSJDGetKrylovStart() is PETSC_FALSE and the user provides vectors with EPSSetInitialSpace(), up to initialsize vectors will be used; and if the provided vectors are not enough, the solver completes the subspace with random vectors. In the case of EPSJDGetKrylovStart() being PETSC_TRUE, the solver gets the first vector provided by the user or, if not available, a random vector, and expands the Krylov basis up to initialsize vectors.

See Also

EPSJDSetInitialSize(), EPSJDGetKrylovStart()

Level

advanced

Location

src/eps/impls/davidson/jd/jd.c

Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages