PCSetDiagonalScale#

Indicates the left scaling to use to apply an additional left and right scaling as needed by certain time-stepping codes.

Synopsis#

#include "petscksp.h" 
PetscErrorCode PCSetDiagonalScale(PC pc, Vec s)

Logically Collective

Input Parameters#

  • pc - the preconditioner context

  • s - scaling vector

Notes#

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

PCDiagonalScaleLeft() scales a vector by D. PCDiagonalScaleRight() scales a vector by D^{-1}.

See Also#

PCCreate(), PCSetUp(), PCDiagonalScaleLeft(), PCDiagonalScaleRight(), PCGetDiagonalScale()

Level#

intermediate

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