PCGetDiagonalScale#
Indicates if the preconditioner applies an additional left and right scaling as needed by certain time-stepping codes.
Synopsis#
#include "petscksp.h"
PetscErrorCode PCGetDiagonalScale(PC pc, PetscBool *flag)
Logically Collective
Input Parameter#
pc - the preconditioner context
Output Parameter#
flag -
PETSC_TRUE
if it applies the scaling
Note#
If this returns PETSC_TRUE
then the system solved via the Krylov method is
D M A D^{-1} y = D M b for left preconditioning or
D A M D^{-1} z = D b for right preconditioning
See Also#
PC
, PCCreate()
, PCSetUp()
, PCDiagonalScaleLeft()
, PCDiagonalScaleRight()
, PCSetDiagonalScale()
Level#
developer
Location#
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages