fixes

diff --git a/src/spirals.cpp b/src/spirals.cpp
index 3b72a4eb3bc63a884c01a728cf7c4dcc26508cc2..8877091aae4d2d9703431c43c691fd383f81fb6c 100644 (file)
--- a/src/spirals.cpp
+++ b/src/spirals.cpp
@@ -299,10 +299,18 @@ Spirals::analyzeFrame(int frnr, const t_trxframe &fr, t_pbc *pbc,
         copy_rvec(sel[i].position(0).x(), temp[i]);
     }
 
-    RVec mid = 0, arrow = 0;
+    RVec mid, arrow;
+
+    mid[0] = 0;
+    mid[1] = 0;
+    mid[2] = 0;
+
+    arrow[0] = 0;
+    arrow[1] = 0;
+    arrow[2] = 0;
 
     for (int i = 0; i < sel.size(); i++) {
-        copy_rvec(sel[i].position(0).x(), mid);
+        rvec_inc(temp[i], mid);
     }
     mid[0] /= sel.size();
     mid[1] /= sel.size();