<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"> Hi Mary, thanks for your reply.<br><br> I did not use any function like gsn_add_polyxx or gsn_add_text, which can be handled as in the FAQ.<br><br> In my case, I use the procedure "overlay" to overlay several plots on a base plot,<br><br> as in this function a. The problem is that the "res for plot1" and "res for plot2"<br><br> are forgotten. The warning will persist even if "res for plot1" and "res for plot2"<br><br> are commented. They only disappear when I comment the "overlay" procedure.<br><br> function a<br> <br> rex@xxx = xxx<br> plot = gsn_csm_xy(wks,x,y,res)<br><br> res@xxx = xxx ; call this as "res for plot1"<br> plot1 = gsn_csm_xy(wks,x,y,res)<br> res@xxx = xxx ; call this as "res for plot2"<br> plot2 = gsn_csm_xy(wks,x,y,res)<br> <br> overlay(plot,plot1)<br> overlay(plot,plot2)<br> return(plot)<br><br>end function a<br><br><br><br><br><div style="position:relative;zoom:1"></div><div id="divNeteaseMailCard"></div><br>At 2017-03-07 23:36:31, "Mary Haley" <haley@ucar.edu> wrote:<br> <blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><div dir="ltr"><div class="gmail_default" style="font-size:small">Cheung,</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">See:</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default"><a href="http://www.ncl.ucar.edu/FAQ/#err_msgs_027">http://www.ncl.ucar.edu/FAQ/#err_msgs_027<br></a></div><div class="gmail_default"><br></div><div class="gmail_default">When you get warnings about "tfPolyDrawList", this should have to do with code where you are attaching polylines, polygons, polymarkers, or text to a plot, and not in the creation of the plot itself.</div><div class="gmail_default"><br></div><div class="gmail_default">Do you have any code where you are calling gsn_add_polyxxxx or gsn_add_text? If so, then please read the above FAQ question about how to make sure your return values for each call are unique.</div><div class="gmail_default"><br></div><div class="gmail_default">--Mary</div><div class="gmail_default"><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 7, 2017 at 7:44 AM, Cheung <span dir="ltr"><<a href="mailto:zuibeidemei@126.com" target="_blank">zuibeidemei@126.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div><i><b>Dear NCL:</b></i></div><div><br></div><div><i><b> I use a function to generate certain type of plot.</b></i></div><div><i><b> Inside this function, several plots are overlaid on a base plot, like this:</b></i></div><div><br></div><div><i><b> function a</b></i></div><div><i><b> </b></i></div><div><i><b> rex@xxx = xxx</b></i></div><div><i><b> plot = gsn_csm_xy(wks,x,y,res)</b></i></div><div><i><b> res@xxx = xxx ; call this as "res for plot1"</b></i></div><div><i><b> plot1 = gsn_csm_xy(wks,x,y,res)</b></i></div><div><i><b> res@xxx = xxx ; call this as "res for plot2"</b></i></div><div><i><b> plot2 = gsn_csm_xy(wks,x,y,res)</b></i></div><div><i><b> overlay(plot,plot1)</b></i></div><div><i><b> overlay(plot,plot2)</b></i></div><div><i><b> return(plot)</b></i></div><div><br></div><div><i><b>end function a</b></i></div><div><br></div><div><i><b> Such codes will generate "warning TransformPreDraw: tfPolyDrawList element 0".</b></i></div><div><i><b> Although plot1 and plot 2 can be overlaid to the base plot when this function a is called, </b></i></div><div><i><b> the resultant plot lose all "res for plot1, 2". </b></i><i><b>I guess this is because the new "res" are not </b></i></div><div><i><b> "alive" when this plot is returned. </b></i><i><b>Is there any way to solve this?</b></i></div><div><br></div><div><i><b> Thanks for your help.</b></i></div><div><br></div><div><i><b>Best</b></i></div><span class="HOEnZb"><font color="#888888"><div><i><b>Cheung</b></i></div><div><i><b> </b></i></div><div> </div></font></span></div><br><br><span title="neteasefooter"><p> </p></span><br>______________________________<wbr></wbr>_________________<br>
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