petsc-3.7.7 2017-09-25
   
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
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages
Examples
src/snes/examples/tutorials/ex30.c.html