slepc-3.6.3 2016-03-29
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# EPSGDSetDoubleExpansion

Activate a variant where the search subspace is expanded with K*[A*x B*x] (double expansion) instead of the classic K*r, where K is the preconditioner, x the selected approximate eigenvector and r its associated residual vector.

### Synopsis

    #include "slepceps.h"
    PetscErrorCode EPSGDSetDoubleExpansion(EPS eps,PetscBool use_gd2)

Logically Collective on EPS

### Input Parameters

| eps | - the eigenproblem solver context
| use_gd2 | - the boolean flag

### Options Database Keys

-eps_gd_double_expansion - activate the double-expansion variant of GD

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