From 77c50ad63b99c59295ac59acef32f0a10dfad571 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Sun, 1 Jun 2014 23:42:34 +0000
Subject: [PATCH] Patch by Micha  Wichrowski: make sure we call collective
 operations from everywhere.

git-svn-id: https://svn.dealii.org/trunk@33001 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/source/numerics/matrix_tools.cc | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/deal.II/source/numerics/matrix_tools.cc b/deal.II/source/numerics/matrix_tools.cc
index 063602a74e..dbb7d854f6 100644
--- a/deal.II/source/numerics/matrix_tools.cc
+++ b/deal.II/source/numerics/matrix_tools.cc
@@ -1,7 +1,7 @@
 // ---------------------------------------------------------------------
 // $Id$
 //
-// Copyright (C) 1998 - 2013 by the deal.II authors
+// Copyright (C) 1998 - 2014 by the deal.II authors
 //
 // This file is part of the deal.II library.
 //
@@ -2403,7 +2403,14 @@ namespace MatrixTools
 
             right_hand_side.set (indices, solution_values);
           }
-
+	else
+	  {
+            // clear_rows() is a collective operation so we still have to call
+            // it:
+            std::vector<types::global_dof_index> constrained_rows;
+            matrix.clear_rows (constrained_rows, 1.);
+	  }
+	
         // clean up
         matrix.compress ();
         solution.compress (VectorOperation::insert);
-- 
2.39.5