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 linear eigensolver context

  • initialsize - number of vectors of the initial searching subspace

Options Database Key#

  • -eps_gd_initial_size <initialsize> - number of vectors of the initial searching subspace

Notes#

If the flag in EPSGDSetKrylovStart() is set to 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 case the EPSGDSetKrylovStart() flag is 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.

Detailed information can be found at [Romero and Roman, 2014].

References#

[Rom14]

E. Romero and J. E. Roman. A parallel implementation of Davidson methods for large-scale eigenvalue problems in SLEPc. ACM Trans. Math. Software, 40(2):13:1–13:29, 2014. doi:10.1145/2543696.

See Also#

EPS: Eigenvalue Problem Solver, EPSGD, EPSGDGetInitialSize(), EPSGDSetKrylovStart()

Level#

advanced

Location#

src/eps/impls/davidson/gd/gd.c

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