From a559ad0c45e506080a3ffca7b374060e0eeaaee6 Mon Sep 17 00:00:00 2001
From: sjplimp <sjplimp@f3b2605a-c512-4ea7-a41b-209d697bcdaa>
Date: Tue, 19 Jun 2012 14:20:40 +0000
Subject: [PATCH] git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@8325
 f3b2605a-c512-4ea7-a41b-209d697bcdaa

---
 src/MOLECULE/dihedral_helix.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/MOLECULE/dihedral_helix.cpp b/src/MOLECULE/dihedral_helix.cpp
index c9da759d21..e9c17392d4 100644
--- a/src/MOLECULE/dihedral_helix.cpp
+++ b/src/MOLECULE/dihedral_helix.cpp
@@ -188,7 +188,7 @@ void DihedralHelix::compute(int eflag, int vflag)
     if (c < -1.0) c = -1.0;
 
     phi = acos(c);
-    if (dx < 0.0) phi *= -1.0;
+    if (dx > 0.0) phi *= -1.0;
     si = sin(phi);
     if (fabs(si) < SMALLER) si = SMALLER;
     siinv = 1.0/si;