<div dir="ltr"><span style="font-size:12.8px">Hi Mary and NCL,</span><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">The script for the arrow-<span class="gmail-il">head</span> can only work in the X and Y are in cartesian coordinate. It did NOT work when <b>X is the latitude and Y is the height</b> (hPa), the head of the vector is placed wrongly when I used "polylines" function. Can you help me with this issue?</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">Best,</div><div style="font-size:12.8px"><span style="font-size:12.8px"><br></span></div><div style="font-size:12.8px"><span style="font-size:12.8px">Chang</span><br></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, May 11, 2017 at 3:42 PM, Mary Haley <span dir="ltr"><<a href="mailto:haley@ucar.edu" target="_blank">haley@ucar.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div style="font-size:small">Xi,</div><div style="font-size:small"><br></div><div style="font-size:small">I don't think we have any examples of this, but I typed "arrow polyline" in the search box of the NCL home page, and found this post by Arindam Chakraborty:</div><div style="font-size:small"><br></div><div><a href="https://www.ncl.ucar.edu/Support/talk_archives/2010/1344.html" target="_blank">https://www.ncl.ucar.edu/<wbr>Support/talk_archives/2010/<wbr>1344.html</a><br></div><div><br></div><div>I've attached the arrow.ncl script that he included in that post. You should be able to run it as-is.</div><div><br></div><div>--Mary</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Wed, May 10, 2017 at 5:28 PM, Xi Chang <span dir="ltr"><<a href="mailto:xi.chang01@gmail.com" target="_blank">xi.chang01@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">Dear NCL,<div><br></div><div>Is there any a function to <span style="color:rgb(0,0,0)">add an arrow head to show the direction of a line (using polylines)?</span></div><div><span style="color:rgb(0,0,0)">Thanks a lot,</span></div><div><span style="color:rgb(0,0,0)"><br></span></div><div><span style="color:rgb(0,0,0)">Best,</span></div><div><span style="color:rgb(0,0,0)">Xi</span></div></div>
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