fix variable delete bug reported in #1346

src/variable.cpp

@@ -1101,6 +1101,7 @@ void Variable::remove(int n)
     pad[i-1] = pad[i];
     reader[i-1] = reader[i];
     data[i-1] = data[i];
+    dvalue[i-1] = dvalue[i];
   }
   nvar--;
 }