PEPErrorView#

Displays the errors associated with the computed solution (as well as the eigenvalues).

Synopsis#

#include "slepcpep.h" 
PetscErrorCode PEPErrorView(PEP pep,PEPErrorType etype,PetscViewer viewer)

Collective

Input Parameters#

pep - the polynomial eigensolver context
etype - error type
viewer - optional visualization context

Options Database Keys#

-pep_error_absolute - print absolute errors of each eigenpair
-pep_error_relative - print relative errors of each eigenpair
-pep_error_backward - print backward errors of each eigenpair

Notes#

By default, this function checks the error of all eigenpairs and prints the eigenvalues if all of them are below the requested tolerance. If the viewer has format PETSC_VIEWER_ASCII_INFO_DETAIL then a table with eigenvalues and corresponding errors is printed.

All the command-line options listed above admit an optional argument specifying the viewer type and options. For instance, use -pep_error_relative :myerr.m:ascii_matlab to save the errors in a file that can be executed in Matlab.