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 linear eigensolver 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#

EPS: Eigenvalue Problem Solver, EPSJDSetInitialSize(), EPSJDGetKrylovStart()

Level#

advanced

Location#

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

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