slepc-3.13.0 2020-03-31
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Sets an ADDITIONAL function to be called at every iteration to monitor the error estimates for each requested singular triplet.


#include "slepcsvd.h" 
PetscErrorCode SVDMonitorSet(SVD svd,PetscErrorCode (*monitor)(SVD,PetscInt,PetscInt,PetscReal*,PetscReal*,PetscInt,void*),void *mctx,PetscErrorCode (*monitordestroy)(void**))
Collective on svd

Input Parameters

svd  - singular value solver context obtained from SVDCreate()
monitor  - pointer to function (if this is NULL, it turns off monitoring)
mctx  - [optional] context for private data for the monitor routine (use NULL if no context is desired)

Calling Sequence of monitor

  monitor(SVD svd,PetscInt its,PetscInt nconv,PetscReal *sigma,PetscReal *errest,PetscInt nest,void *mctx)

svd  - singular value solver context obtained from SVDCreate()
its  - iteration number
nconv  - number of converged singular triplets
sigma  - singular values
errest  - relative error estimates for each singular triplet
nest  - number of error estimates
mctx  - optional monitoring context, as set by SVDMonitorSet()

Options Database Keys

-svd_monitor  - print only the first error estimate
-svd_monitor_all  - print error estimates at each iteration
-svd_monitor_conv  - print the singular value approximations only when convergence has been reached
-svd_monitor_lg  - sets line graph monitor for the first unconverged approximate singular value
-svd_monitor_lg_all  - sets line graph monitor for all unconverged approximate singular values
-svd_monitor_cancel  - cancels all monitors that have been hardwired into a code by calls to SVDMonitorSet(), but does not cancel those set via the options database.


Several different monitoring routines may be set by calling SVDMonitorSet() multiple times; all will be called in the order in which they were set.

See Also

SVDMonitorFirst(), SVDMonitorAll(), SVDMonitorCancel()

Location: src/svd/interface/svdmon.c
Index of all SVD routines
Table of Contents for all manual pages
Index of all manual pages