From: Timo Heister <timo.heister@gmail.com>
Date: Tue, 26 Jan 2016 09:51:57 +0000 (+0100)
Subject: fix the case where we reduce to 1 domain
X-Git-Tag: v8.4.0-rc2~51^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9aac427ca6f25c588055ea495c821f4e941675c1;p=dealii.git

fix the case where we reduce to 1 domain
---

diff --git a/source/lac/sparsity_tools.cc b/source/lac/sparsity_tools.cc
index 813c4edd33..05ac8aa848 100644
--- a/source/lac/sparsity_tools.cc
+++ b/source/lac/sparsity_tools.cc
@@ -57,7 +57,7 @@ namespace SparsityTools
                                  sparsity_pattern.n_rows()));
 
     // check for an easy return
-    if (n_partitions == 1)
+    if (n_partitions == 1 || (sparsity_pattern.n_rows()==1))
       {
         std::fill_n (partition_indices.begin(), partition_indices.size(), 0U);
         return;