From: guido <guido@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Fri, 6 Oct 2000 10:41:33 +0000 (+0000)
Subject: Improved breakdown criterion?
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8b0288f69a3e6bf55a2c470d90a0216d05e58e8;p=dealii-svn.git

Improved breakdown criterion?


git-svn-id: https://svn.dealii.org/trunk@3386 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/lac/include/lac/solver_qmrs.h b/deal.II/lac/include/lac/solver_qmrs.h
index 8cf343f4b1..356a30fe13 100644
--- a/deal.II/lac/include/lac/solver_qmrs.h
+++ b/deal.II/lac/include/lac/solver_qmrs.h
@@ -326,10 +326,10 @@ while (state == SolverControl::iterate)
       A.vmult(t,q);
 				       // Step 2
       sigma = q*t;
-
+      
 //TODO: Find a really good breakdown criterion
 // The absolute one detects breakdown instead of convergence
-      if (fabs(sigma) < additional_data.breakdown)
+      if (fabs(sigma/rho) < additional_data.breakdown)
 	return breakdown;
 				       // Step 3
       alpha = rho/sigma;