petsc-3.7.7 2017-09-25

KSPUnwindPreconditioner

Unwinds the preconditioning in the solution. That is, takes solution to the preconditioned problem and gets the solution to the original problem from it.

Synopsis

#include "petscksp.h" 
PetscErrorCode  KSPUnwindPreconditioner(KSP ksp,Vec vsoln,Vec vt1)

Collective on KSP

Input Parameters

	ksp	- iterative context
	vsoln	- solution vector
	vt1	- temporary work vector

Output Parameter

vsoln -contains solution on output

Notes

If preconditioning either symmetrically or on the right, this routine solves for the correction to the unpreconditioned problem. If preconditioning on the left, nothing is done.

Keywords