slepc-3.15.0 2021-03-31
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Sets a flag to indicate that refined vectors must be computed.


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

Input Parameter

ds  - the direct solver context
ref  - a boolean flag


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()

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