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 PC 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

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Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages