petsc-3.14.6 2021-03-30
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 on PC
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
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages