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<p style="margin-top:0;margin-bottom:0">Hi Ning,</p>
<p style="margin-top:0;margin-bottom:0"> I think as long as you have the missing value defined, you should be able to use "where": <a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml" class="OWAAutoLink" id="LPlnk985055" previewremoved="true">https://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml</a></p>
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<div>There are some examples there that seem to do what you want. Basically, something like:</div>
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<p style="margin-top:0;margin-bottom:0">T2 = where(ismissing(T2),T5,T2) ; assuming the arrays are the same size</p>
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<p><span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:16px">Nick Bassill, PhD</span></p>
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Modeler & Meteorologist, Center Of Excellence (Prior: NYS Mesonet)</p>
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LC SB-28, 1400 Washington Ave.,</p>
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SUNY, University at Albany, NY 12222</p>
(518) 442-6375</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> ncl-talk <ncl-talk-bounces@ucar.edu> on behalf of ma.n2007 <ma.n2007@aliyun.com><br>
<b>Sent:</b> Wednesday, April 18, 2018 9:45 AM<br>
<b>To:</b> ncl-talk<br>
<b>Subject:</b> [ncl-talk] updated-how to replace missing value</font>
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<div style="font-size:14.6667px">Hi Sir,</div>
<div style="font-size:14.6667px">Let me show my question in a more clear manner. If I have two data: T2 (time, lat, lon) is 2 m temperature, and T5(time, lat, lon) is 5 m temperature.</div>
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<div style="font-size:14.6667px">T2 is what I want to use, but in some cases T2 has missing values. I want to use T5 data (if this grid is not missing value) to fill T2's missing value. Could you please tell me how can I do？ Thanks so much!</div>
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<div style="font-size:14.6667px">Ning</div>
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<div><b>From:</b> <a href="mailto:ma.n2007@aliyun.com" id="LPlnk479926" previewremoved="true">ma.n2007</a></div>
<div><b>Date:</b> 2018-04-18 21:38</div>
<div><b>To:</b> <a href="mailto:ncl-talk@ucar.edu" id="LPlnk247660" previewremoved="true">ncl-talk</a></div>
<div><b>Subject:</b> [ncl-talk] how to replace missing value</div>
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<div>Hi Sir,</div>
<div>Imagin that I have two data X and Y, both are with (tim, lat, lon).</div>
<div>If some grids of Y has missing values, while X does not. How can I replace the missing values in Y with the X grid value? This could fill the Y.</div>
<div>Could you please help me? </div>
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<div>Thanks</div>
<div>Ning</div>
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