From: bangerth Date: Fri, 30 Mar 2007 22:09:07 +0000 (+0000) Subject: Add comment. X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=595b3e9a4580245ad7e2efadf4b54a5850acfcf3;p=dealii-svn.git Add comment. git-svn-id: https://svn.dealii.org/trunk@14611 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/lac/include/lac/petsc_precondition.h b/deal.II/lac/include/lac/petsc_precondition.h index 417b957741..d4a36c3ec0 100644 --- a/deal.II/lac/include/lac/petsc_precondition.h +++ b/deal.II/lac/include/lac/petsc_precondition.h @@ -2,7 +2,7 @@ // $Id$ // Version: $Name$ // -// Copyright (C) 2004, 2005, 2006 by the deal.II authors +// Copyright (C) 2004, 2005, 2006, 2007 by the deal.II authors // // This file is subject to QPL and may not be distributed // without copyright and license information. Please refer @@ -38,9 +38,14 @@ namespace PETScWrappers * classes in this hierarchy don't do a whole lot, except for providing a * function that sets the preconditioner and certain parameters on the * preconditioning context of the solver. These classes are basically here - * only to allow a similar interface than already used for the deal.II solver + * only to allow a similar interface as already used for the deal.II solver * and preconditioner classes. * + * Note that the classes here only provide interfaces to the relevant + * functionality of PETSc. PETSc does not implement all preconditioners for + * all matrix types. In particular, some preconditioners are not going to work + * for parallel jobs, such as for example the ILU preconditioner. + * * @ingroup PETScWrappers * @author Wolfgang Bangerth, 2004 */