From 9aac427ca6f25c588055ea495c821f4e941675c1 Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Tue, 26 Jan 2016 10:51:57 +0100
Subject: [PATCH] fix the case where we reduce to 1 domain

---
 source/lac/sparsity_tools.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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;
-- 
2.39.5