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<p class="MsoNormal">Cathy<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I use two ways of doing this; which is better depends a bit on how many ‘classifications’ you have. If you have just a few the first method is easier; for many classifications (e.g. different markers for each model in a multi-model ensemble)
the 2<sup>nd</sup> method is better:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">Make separate scatterplots for each classification (in your case time period) setting the xyMarkerColor resource each time, then use the overlay() function to merge them. You’ll need
to explicitly ensure that your axis ranges include the full data set using trXMinF, trXMaxF, trYMinF and trYMaxF resources<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">Make a dummy base xy plot with the whole dataset, setting xyLineColor resource to “transparent” (if you want a 1-to-1 or regression fit line you can plot this line using dummy x and
y arrays instead). Then add markers colored as required using gsn_add_polymarker()<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">That’s a bit of a brief, rushed overview – let me know if it’s not clear.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Will<o:p></o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">ncl-talk <ncl-talk-bounces@ucar.edu> on behalf of Cathy Smith <cathy.smith@noaa.gov><br>
<b>Date: </b>Thursday, 21 February 2019 at 3:09 AM<br>
<b>To: </b>"ncl-talk@ucar.edu" <ncl-talk@ucar.edu><br>
<b>Subject: </b>[ncl-talk] advice for a scatter plot<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">NCLers<br>
<br>
I would like to create a scatter plot of 2 time-series. That part is <br>
easy in NCL :) But, I would like to color the markers as a function of <br>
time. That is, if the time series were monthly from 1980-2010, then the <br>
the dot for Jan 1980 pair of values might be blue while Dec 2010 would <br>
transition to red. Is this possible? I see several NCL examples where <br>
the color can be a function of the time-series values but not the itself.<br>
<br>
Thanks for any advice.<br>
<br>
Cathy<br>
<br>
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