petsc-dev 2014-08-26
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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}.

Keywords

PC

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