DSSetRefined#

Sets a flag to indicate that refined vectors must be computed.

Synopsis#

#include "slepcds.h" 
PetscErrorCode DSSetRefined(DS ds,PetscBool ref)

Logically Collective

Input Parameters#

  • ds - the direct solver context

  • ref - a boolean flag

Notes#

Normally the vectors returned in DS_MAT_X are eigenvectors of the projected matrix. With this flag activated, DSVectors() will return the right singular vector of the smallest singular value of matrix \tilde{A}-theta*I, where \tilde{A} is the extended (n+1)xn matrix and theta is the Ritz value. This is used in the refined Ritz approximation.

The default is PETSC_FALSE.

See Also#

DSVectors(), DSGetRefined()

Level#

advanced

Location#

src/sys/classes/ds/interface/dsbasic.c

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