From a608185b5dc1246727ab8586519c34ca64886bcf Mon Sep 17 00:00:00 2001
From: Michael Gecht <gecht.m@gmail.com>
Date: Thu, 20 Sep 2018 11:23:35 +0200
Subject: [PATCH] Fix stacking of results

---
 pmda/custom.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pmda/custom.py b/pmda/custom.py
index 7fda4c19..6a35329d 100644
--- a/pmda/custom.py
+++ b/pmda/custom.py
@@ -100,7 +100,7 @@ def _single_frame(self, ts, atomgroups):
         return self.function(*args, **self.kwargs)
 
     def _conclude(self):
-        self.results = np.hstack(self._results)
+        self.results = np.vstack(self._results)
 
 
 def analysis_class(function):