PCApplyBAorABTranspose#
Applies the transpose of the preconditioner and operator to a vector. That is, applies \(B^T * A^T\) with left preconditioning, NOT \((B*A)^T = A^T*B^T\).
Synopsis#
#include "petscksp.h" 
PetscErrorCode PCApplyBAorABTranspose(PC pc, PCSide side, Vec x, Vec y, Vec work)
Collective
Input Parameters#
- pc - the - PCpreconditioner 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#
This routine is used internally so that the same Krylov code can be used to solve \(A x = b\) and \(A^T x = b\), with a preconditioner defined by \(B^T\). This is why this has the funny form that it computes \(B^T * A^T\)
See Also#
KSP: Linear System Solvers, PC, PCApply(), PCApplyTranspose(), PCApplyBAorAB()
Level#
developer
Location#
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages