petsc-3.11.4 2019-09-28
KSPMonitorSingularValue
Prints the two norm of the true residual and estimation of the extreme singular values of the preconditioned problem at each iteration.
Synopsis
#include "petscksp.h"
PetscErrorCode KSPMonitorSingularValue(KSP ksp,PetscInt n,PetscReal rnorm,PetscViewerAndFormat *dummy)
Logically Collective on KSP
Input Parameters
| ksp | - the iterative context
|
| n | - the iteration
|
| rnorm | - the two norm of the residual
|
Options Database Key
-ksp_monitor_singular_value -Activates KSPMonitorSingularValue()
Notes
The CG solver uses the Lanczos technique for eigenvalue computation,
while GMRES uses the Arnoldi technique; other iterative methods do
not currently compute singular values.
Keywords
KSP, CG, default, monitor, extreme, singular values, Lanczos, Arnoldi
See Also
KSPComputeExtremeSingularValues()
Level
intermediate
Location
src/ksp/ksp/interface/iterativ.c
Examples
src/snes/examples/tutorials/ex30.c.html
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages