<div dir="ltr"><div>Hi Xiaoming,</div>NaN's are likely present in your wetland_CH4_emissions_ens array. You can use isnan_ieee/replace_ieeenan to fix that:<div><a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/isnan_ieee.shtml">https://www.ncl.ucar.edu/Document/Functions/Built-in/isnan_ieee.shtml</a></div><div>Adam</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 23, 2021 at 11:01 AM xiaoming Hu via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu">ncl-talk@mailman.ucar.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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4-dimension array summary is actually before applying dim_avg_n_Wrap<br>
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See more detailed diagnose, code: <br>
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printVarSummary(wetland_CH4_emissions_ens)
<div> printMinMax(wetland_CH4_emissions_ens,0)</div>
wetland_CH4_emissions = dim_avg_n_Wrap(wetland_CH4_emissions_ens,0) ; [model | 18] x [time | 228] x [lat | 360] x [lon | 720]
<div> print("got ensembe everage")</div>
<div> printMinMax(wetland_CH4_emissions,0)</div>
<div> printVarSummary(wetland_CH4_emissions)</div>
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Output:</div>
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Variable: wetland_CH4_emissions_ens
<div>Type: double</div>
<div>Total Size: 8510054400 bytes</div>
<div> 1063756800 values</div>
<div>Number of Dimensions: 4</div>
<div>Dimensions and sizes: [model | 18] x [time | 228] x [lat | 360] x [lon | 720]</div>
<div>Coordinates: </div>
<div> model: [1913..3934]</div>
<div> time: [ 1.. 228]</div>
<div>Number Of Attributes: 1</div>
<div> units : mg CH4 m-2 day-1</div>
<div>(0) min=-0 max=535.915259495705</div>
<div>(0) got ensembe everage</div>
<div>(0) min=-nan max=-nan</div>
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<div>Variable: wetland_CH4_emissions</div>
<div>Type: double</div>
<div>Total Size: 472780800 bytes</div>
<div> 59097600 values</div>
<div>Number of Dimensions: 3</div>
<div>Dimensions and sizes: [time | 228] x [lat | 360] x [lon | 720]</div>
<div>Coordinates: </div>
<div> time: [ 1.. 228]</div>
<div>Number Of Attributes: 2</div>
<div> units : mg CH4 m-2 day-1</div>
<div> average_op_ncl : dim_avg_n over dimension(s): model</div>
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<div id="gmail-m_2290904745110384921divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Dennis Shea <<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>><br>
<b>Sent:</b> Friday, April 23, 2021 11:53 AM<br>
<b>To:</b> xiaoming Hu <<a href="mailto:yuanfangcan@hotmail.com" target="_blank">yuanfangcan@hotmail.com</a>><br>
<b>Cc:</b> <a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@ucar.edu</a> <<a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@ucar.edu</a>><br>
<b>Subject:</b> Re: [ncl-talk] all nan after dim_avg_n_Wrap</font>
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<div>The source array is: [model | 18] x [time | 228] x [lat | 360] x [lon | 720]</div>
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<div>The output array from:<br>
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<div>wetland_CH4_emissions = dim_avg_n_Wrap(wetland_CH4_emissions_ens,0)</div>
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<div>should be 3-dimensions: [time | 228] x [lat | 360] x [lon | 720]</div>
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<div>You show 4-dimensions.<br>
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<div dir="ltr">On Fri, Apr 23, 2021 at 10:07 AM xiaoming Hu via ncl-talk <<a href="mailto:ncl-talk@mailman.ucar.edu" target="_blank">ncl-talk@mailman.ucar.edu</a>> wrote:<br>
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I have used dim_avg_n_Wrap for a long time and never had issues. But today it led to all nan, any idea? Thanks,<br>
xiaoming<br>
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See my code: <br>
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printVarSummary(wetland_CH4_emissions_ens)
<div> printMinMax(wetland_CH4_emissions_ens,0)</div>
wetland_CH4_emissions = dim_avg_n_Wrap(wetland_CH4_emissions_ens,0) ; [model | 18] x [time | 228] x [lat | 360] x [lon | 720]
<div> print("got ensembe everage")</div>
<div> printMinMax(wetland_CH4_emissions,0)</div>
</div>
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<br>
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and output: <br>
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Variable: wetland_CH4_emissions_ens
<div>Type: double</div>
<div>Total Size: 8510054400 bytes</div>
<div> 1063756800 values</div>
<div>Number of Dimensions: 4</div>
<div>Dimensions and sizes: [model | 18] x [time | 228] x [lat | 360] x [lon | 720]</div>
<div>Coordinates: </div>
<div> model: [1913..3934]</div>
<div> time: [ 1.. 228]</div>
<div>Number Of Attributes: 1</div>
<div> units : mg CH4 m-2 day-1</div>
<div>(0) min=-0 max=535.915259495705</div>
<div>(0) got ensembe everage</div>
<div>(0) min=-nan max=-nan</div>
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