QEPComputeResidualNorm
Computes the norm of the residual vector associated with the i-th computed eigenpair.
Synopsis
#include "slepcqep.h"
PetscErrorCode QEPComputeResidualNorm(QEP qep, PetscInt i, PetscReal *norm)
Collective on QEP
Input Parameter
qep - the quadratic eigensolver context
i - the solution index
Output Parameter
norm - the residual norm, computed as ||(l^2*M+l*C+K)x||_2 where l is the
eigenvalue and x is the eigenvector.
If l=0 then the residual norm is computed as ||Kx||_2.
Notes
The index i should be a value between 0 and nconv-1 (see QEPGetConverged()).
Eigenpairs are indexed according to the ordering criterion established
with QEPSetWhichEigenpairs().
See Also
QEPSolve(), QEPGetConverged(), QEPSetWhichEigenpairs()
Location: src/qep/interface/qepsolve.c
Index of all QEP routines
Table of Contents for all manual pages
Index of all manual pages