KSPSetOptionsPrefix#
Sets the prefix used for searching for all KSP
options in the database.
Synopsis#
#include "petscksp.h"
PetscErrorCode KSPSetOptionsPrefix(KSP ksp, const char prefix[])
Logically Collective
Input Parameters#
ksp - the Krylov context
prefix - the prefix string to prepend to all
KSP
option requests
Notes#
A hyphen (-) must NOT be given at the beginning of the prefix name. The first character of all runtime options is AUTOMATICALLY the hyphen.
For example, to distinguish between the runtime options for two
different KSP
contexts, one could call
KSPSetOptionsPrefix(ksp1,"sys1_")
KSPSetOptionsPrefix(ksp2,"sys2_")
This would enable use of different options for each system, such as
-sys1_ksp_type gmres -sys1_ksp_rtol 1.e-3
-sys2_ksp_type bcgs -sys2_ksp_rtol 1.e-4
See Also#
KSP: Linear System Solvers, KSP
, KSPAppendOptionsPrefix()
, KSPGetOptionsPrefix()
, KSPSetFromOptions()
Level#
advanced
Location#
Examples#
src/dm/impls/swarm/tutorials/ex1.c
src/dm/impls/swarm/tutorials/ex1f90.F90
src/ksp/ksp/tutorials/ex42.c
src/ksp/ksp/tutorials/ex43.c
src/ksp/ksp/tutorials/ex49.c
src/ksp/ksp/tutorials/ex59.c
src/ksp/ksp/tutorials/ex70.c
src/tao/tutorials/ex3.c
src/ts/utils/dmplexlandau/tutorials/ex1f90.F90
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages