slepc-3.22.1 2024-10-28
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
Index of all DS routines
Table of Contents for all manual pages
Index of all manual pages