petscmaster 20190421
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 and Vec
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.
Keywords
PC, apply, operator
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