petscmaster 20190923
PCApplyBAorAB
Applies the preconditioner and operator to a vector. y = B*A*x or y = A*B*x.
Synopsis
#include "petscksp.h"
PetscErrorCode PCApplyBAorAB(PC pc,PCSide side,Vec x,Vec y,Vec work)
Collective on PC
Input Parameters
 pc   the preconditioner context

 side   indicates the preconditioner side, one of PC_LEFT, PC_RIGHT, or PC_SYMMETRIC

 x   input vector

 work   work vector

Output Parameter
y output vector
Notes
If the PC has had PCSetDiagonalScale() set then D M A D^{1} for left preconditioning or D A M D^{1} is actually applied. Note that the
specific KSPSolve() method must also be written to handle the postsolve "correction" for the diagonal scaling.
See Also
PCApply(), PCApplyTranspose(), PCApplyBAorABTranspose()
Level
developer
Location
src/ksp/pc/interface/precon.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages