I am not sure I understand. Is the solution to change all the vectors so that their sign is positive before integrating the streamlines?<br><br>-berk<br><br><div class="gmail_quote">On Thu, May 7, 2009 at 12:55 PM, Martin Bates <span dir="ltr"><<a href="mailto:mabates99@yahoo.co.uk">mabates99@yahoo.co.uk</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>