petsc-3.3-p7 2013-05-11

PCCompositeSetUseTrue

Sets a flag to indicate that the true matrix (rather than the matrix used to define the preconditioner) is used to compute the residual when the multiplicative scheme is used.

Synopsis

#include "petscpc.h" 
#include "petscksp.h" 
PetscErrorCode  PCCompositeSetUseTrue(PC pc)

Logically Collective on PC

Input Parameters

pc -the preconditioner context

Options Database Key

-pc_composite_true -Activates PCCompositeSetUseTrue()

Note

For the common case in which the preconditioning and linear system matrices are identical, this routine is unnecessary.

Keywords