From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Wed, 20 Mar 2013 03:20:45 +0000 (+0000)
Subject: Use SSOR as preconditioner.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3dfbec7e2abfa8fcddfddcead36a96fdcafa64d0;p=dealii-svn.git

Use SSOR as preconditioner.


git-svn-id: https://svn.dealii.org/trunk@28948 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/examples/step-26/step-26.cc b/deal.II/examples/step-26/step-26.cc
index 91de3ff1a3..39d037c00f 100644
--- a/deal.II/examples/step-26/step-26.cc
+++ b/deal.II/examples/step-26/step-26.cc
@@ -188,7 +188,10 @@ namespace Step26
     SolverControl solver_control(1000, 1e-8 * system_rhs.l2_norm());
     SolverCG<> cg(solver_control);
 
-    cg.solve(matrix_u, solution_u, system_rhs, PreconditionIdentity());
+    PreconditionSSOR<> preconditioner;
+    preconditioner.initialize(matrix_u, 1.0);
+
+    cg.solve(matrix_u, solution_u, system_rhs, preconditioner);
 
     std::cout << "   u-equation: " << solver_control.last_step()
               << " CG iterations." << std::endl;