PETSc version 3.15.5
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
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 post-solve "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