petsc-3.13.6 2020-09-29
Report Typos and Errors

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