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

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

Note#

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. The specific KSPSolve() method must also be written to handle the post-solve “correction” for the diagonal scaling.

See Also#

KSP: Linear System Solvers, PC, 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