EPSLyapIISetRanks#

Set the ranks used in the solution of the Lyapunov equation.

Synopsis#

#include "slepceps.h" 
PetscErrorCode EPSLyapIISetRanks(EPS eps,PetscInt rkc,PetscInt rkl)

Logically Collective

Input Parameters#

  • eps - the eigenproblem solver context

  • rkc - the compressed rank

  • rkl - the Lyapunov rank

Options Database Key#

  • -eps_lyapii_ranks <rkc,rkl> - Sets the rank parameters

Notes#

PETSC_CURRENT can be used to preserve the current value of any of the arguments, and PETSC_DETERMINE to set them to a default value.

Lyapunov inverse iteration needs to solve a large-scale Lyapunov equation at each iteration of the eigensolver. For this, an iterative solver (LME) is used, which requires to prescribe the rank of the solution matrix X. This is the meaning of parameter rkl. Later, this matrix is compressed into another matrix of rank rkc. If not provided, rkl is a small multiple of rkc.

See Also#

EPSLyapIIGetRanks()

Level#

intermediate

Location#

src/eps/impls/lyapii/lyapii.c

Implementations#

EPSLyapIISetRanks_LyapII() in src/eps/impls/lyapii/lyapii.c

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