slepc-main 2024-11-15
EPSGDSetInitialSize
Sets the initial size of the searching space.
Synopsis
#include "slepceps.h"
PetscErrorCode EPSGDSetInitialSize(EPS eps,PetscInt initialsize)
Logically Collective
Input Parameters
| eps | - the eigenproblem solver context
|
| initialsize | - number of vectors of the initial searching subspace
|
Options Database Key
| -eps_gd_initial_size | - number of vectors of the initial searching subspace
|
Notes
If EPSGDGetKrylovStart() 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 EPSGDGetKrylovStart() 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
EPSGDGetInitialSize(), EPSGDGetKrylovStart()
Level
advanced
Location
src/eps/impls/davidson/gd/gd.c
Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages