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