petsc-3.9.4 2018-09-11

PCGetDiagonalScale

Indicates if the preconditioner applies an additional left and right scaling as needed by certain time-stepping codes.

#include "petscksp.h" 
PetscErrorCode  PCGetDiagonalScale(PC pc,PetscBool  *flag)

Logically Collective on PC

pc -the preconditioner context

flag -PETSC_TRUE if it applies the scaling

Notes: 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

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