slepc-3.17.2 2022-08-09
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Set the ranks used in the solution of the Lyapunov equation.


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

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


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


Location: src/eps/impls/lyapii/lyapii.c
Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages