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#

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#

src/ksp/pc/interface/precon.c

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Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages