From: kronbichler <kronbichler@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Tue, 28 May 2013 12:05:12 +0000 (+0000)
Subject: Another minor fix.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e4b8af77bc46491a0748d57484457b7bf00a6b8e;p=dealii-svn.git

Another minor fix.

git-svn-id: https://svn.dealii.org/trunk@29656 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/include/deal.II/lac/precondition.h b/deal.II/include/deal.II/lac/precondition.h
index c0c2cf9ac7..6f78cf440b 100644
--- a/deal.II/include/deal.II/lac/precondition.h
+++ b/deal.II/include/deal.II/lac/precondition.h
@@ -1822,9 +1822,9 @@ PreconditionChebyshev<MATRIX,VECTOR>::initialize (const MATRIX &matrix,
       min_eigenvalue = data.max_eigenvalue/data.smoothing_range;
     }
 
-  const double alpha = (data.smoothing_range > 0 ?
+  const double alpha = (data.smoothing_range > 1. ?
                         max_eigenvalue / data.smoothing_range :
-                        max_eigenvalue / min_eigenvalue);
+                        std::min(0.9*max_eigenvalue, min_eigenvalue));
   delta = (max_eigenvalue-alpha)*0.5;
   theta = (max_eigenvalue+alpha)*0.5;