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_TRUEif it applies the scaling
Note#
If this returns PETSC_TRUE then the system solved via the Krylov method is, for left and right preconditioning,
\[
\begin{align*}
D M A D^{-1} y = D M b \\
D A M D^{-1} z = D b.
\end{align*}
\]
See Also#
KSP: Linear System Solvers, 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