<div dir="ltr"><div>Please look at the documentation for:<br><br><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml">http://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml</a><br><br></div>Cheers<br><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Apr 17, 2017 at 8:54 AM, gibies george <span dir="ltr"><<a href="mailto:gibiesgeorge@gmail.com" target="_blank">gibiesgeorge@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Thank for your mail.<div dir="auto"><br></div><div dir="auto">But the SST case I discussed is just an example. </div><div dir="auto"><br></div><div dir="auto">My actual problem is to get zonal, meridional and vertical gradient of ocean temperature profile (4D data with time). </div><div dir="auto"><br></div><div dir="auto">I also have to get time tendency of temperature.</div><div dir="auto"><br></div><div dir="auto">That is why I put a generalized mail initially.</div><div dir="auto"><br></div><div dir="auto">Thank and regards</div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Apr 17, 2017 6:46 PM, "Dennis Shea" <<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>NCL has functions to calculate gradients (derivatives).<br><br></div>Your original post did not show that you wanted gradients of SST. Presumably, these have missing values (land).<br></div> <b>ftcurvd </b>will compute gradients but, as noted in the documentation, it does not allow missing values. <br><br></div>NCL has other functions for gradients:<br><div><br> <a href="http://www.ncl.ucar.edu/Applications/gradients.shtml" target="_blank">http://www.ncl.ucar.edu/Applic<wbr>ations/gradients.shtml</a><br><br></div><div>Some use spherical harmonics which are "highly accurate" but, again, do not allow for missing values.<br><br>--<br></div><div>The following 6.4.0 function does allow for missing values.<br><br> <a href="http://www.ncl.ucar.edu/Document/Functions/Contributed/grad_latlon_cfd.shtml" target="_blank">http://www.ncl.ucar.edu/Docume<wbr>nt/Functions/Contributed/grad_<wbr>latlon_cfd.shtml</a><br><br></div><div>Read the documentation. This returns a variable of type 'list.' The list (container) consists of two variables the zonal and meridional gradients.<br></div><div>---<br></div><div>The following is essentially Example 2:<br><br></div><div> fsst = addfile("....","r")<br></div><div> sst = f->SST ; assume a rectilinear grid<br></div><div><pre> sst_grad_list = <strong>grad_latlon_cfd</strong> (sst, sst&lat sst&lon, True, False) ; global<br>;sst_grad_list = <strong>grad_latlon_cfd</strong> (sst, sst&lat sst&lon,False, False) ; regional<br></pre><pre>; for clarity, explicitly extract the variables within the list<br></pre> sst_grad_zonal = sst_grad_list[0] ; [...] is NCL syntax for accessing elements of a list<br></div><div> sst_grad_meriod = sst_grad_list[1] <br></div><div> delete(sst_grad_list)<br></div><div><br></div><div> printVarSummary(sst_grad_zonal<wbr>)<br></div><div> printMinMax(sst_grad_zonal,0)<br></div><div> print("---")<br><div> printVarSummary(sst_grad_merio<wbr>d)<br></div><div> printMinMax(sst_grad_meriod,0)<br></div><br><br></div><div>Good luck<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Apr 17, 2017 at 4:01 AM, gibies george <span dir="ltr"><<a href="mailto:gibies@tropmet.res.in" target="_blank">gibies@tropmet.res.in</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">Thanks for your mail.<div><br></div><div>Suppose if I have to calculate zonal gradient of SST(time|:,lat|:,lon|:)</div><div><br></div><div>xcoord=confirm(<a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/dimsizes.shtml" style="font-size:13.3333px;margin:0px;padding:0px;text-decoration-line:none;color:rgb(133,45,133);font-family:verdana,sans-serif;background:rgb(205,232,251)" target="_blank"><strong style="margin:0px;padding:0px">dimsizes</strong></a><span style="color:rgb(0,0,0);font-family:courier;font-size:13.3333px">(SST),S<wbr>ST&lon,2)</span></div><div>dsst_dx = <strong style="color:rgb(0,0,0);font-family:courier;font-size:13.3333px;margin:0px;padding:0px">ftcurvd</strong><span style="color:rgb(0,0,0);font-family:courier;font-size:13.3333px">(xcoord,SST,SST&lon)</span></div><div><br></div><div><p style="margin:10px 0px 20px;padding:0px;color:rgb(51,51,51);font-family:verdana,sans-serif;font-size:13.3333px;line-height:12pt">Is this correct ?</p><p style="margin:10px 0px 20px;padding:0px;color:rgb(51,51,51);font-family:verdana,sans-serif;font-size:13.3333px;line-height:12pt"></p><a name="m_-6367975140165080679_m_-5441968509144498896_m_-312155885434500526_Errors" style="margin:0px;padding:0px;color:rgb(0,64,255);font-family:verdana,sans-serif;font-size:13.3333px"></a><span style="color:rgb(0,0,0);font-family:verdana,sans-serif;font-size:13.3333px"></span></div></div><div class="gmail_extra"><span><br clear="all"><div><div class="m_-6367975140165080679m_-5441968509144498896m_-312155885434500526gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><b style="font-size:12.8px"><font size="2"><br></font></b></div><div><b style="font-size:12.8px"><font size="2"><br></font></b></div><div><b style="font-size:12.8px"><font size="2">Dr. Gibies George,</font></b><br></div><div><b style="font-size:12.8px"><font size="1">Project Scientist C,</font></b><br></div><div><b style="font-size:12.8px"><font size="1">Monsoon Mission,</font></b><br></div><div><b><font size="1">Indian Institute of Tropical Meteorology,<br>Dr. Homi Bhabha Road, </font></b></div><div><b><font size="1">NCL Post Office, </font></b></div><div><b><font size="1">Pashan, Pune 411008, India.<br>Office Teleph : <a href="tel:+91%2020%202590%204423" value="+912025904423" target="_blank">+912025904423</a><br>Office mail : <a href="mailto:gibies@tropmet.res.in" target="_blank">gibies@tropmet.res.in</a><br><br>______________________________<wbr>______________<br>Vettikuzhiyil House,<br>Ezhakkaranadu South </font></b><b style="font-size:12.8px"><font size="1">Post Office,</font></b><b><font size="1"><br>Puthencruz-682308, Kochi, India.<br>Mobile number : <a href="tel:+91%2090285%2023910" value="+919028523910" target="_blank">+919028523910</a>, <a href="tel:+91%2094204%2007392" value="+919420407392" target="_blank">+919420407392</a>, <br>Personal mail : <a href="mailto:gibiesgeorge@gmail.com" target="_blank">gibiesgeorge@gmail.com</a><br><a href="http://sites.google.com/site/gibiesge/" target="_blank">http://sites.google.com/site/g<wbr>ibiesge/</a></font></b><div style="margin-left:80px"><div><b><font size="1"><br></font></b></div></div><font color="#274e13"><b><span style="font-family:Arial;font-size:16px">______________________________<wbr>_________________________</span><br>"Please do not print this e-mail unless you really need. Because every 3000 pages cost a tree. </b></font><div><b><font color="#274e13">Save Trees, Save mother Earth."</font> </b><div style="margin-left:80px"><span style="font-size:small"><font color="#38761d"><b></b></font></span></div><div style="margin-left:80px"><span style="font-size:small"><font color="#38761d"><b></b></font></span></div><font size="1"><br></font></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br></span><div><div class="m_-6367975140165080679m_-5441968509144498896h5"><div class="gmail_quote">On 13 April 2017 at 20:31, Andy <span dir="ltr"><<a href="mailto:awmiller@mit.edu" target="_blank">awmiller@mit.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p><font size="+1"><font face="Times New Roman, Times, serif">Yes,
you can use ftcurvd.</font></font></p>
<p><font size="+1"><font face="Times New Roman, Times, serif">Andy</font></font><br>
</p>
<pre class="m_-6367975140165080679m_-5441968509144498896m_-312155885434500526m_-4773659930361685905moz-signature" cols="72">Andy Miller
MIT PAOC PhD Candidate
77 Massachusetts Ave | 54-1715
Cambridge, MA 02139
Phone: <a href="tel:(617)%20253-3715" value="+16172533715" target="_blank">617-253-3715</a>
Email: <a class="m_-6367975140165080679m_-5441968509144498896m_-312155885434500526m_-4773659930361685905moz-txt-link-abbreviated" href="mailto:awmiller@mit.edu" target="_blank">awmiller@mit.edu</a></pre><div><div class="m_-6367975140165080679m_-5441968509144498896m_-312155885434500526h5">
<div class="m_-6367975140165080679m_-5441968509144498896m_-312155885434500526m_-4773659930361685905moz-cite-prefix">On 04/13/2017 02:46 AM, gibies george
wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="m_-6367975140165080679m_-5441968509144498896m_-312155885434500526h5">
<div dir="ltr">Dear friends,
<div><br>
</div>
<div>Is there a function available to find partial derivative of
a variable along one of its coordinate (say, lonx, laty, levz,
time, etc ) ?</div>
<div><br>
</div>
<div>thanks and regards<br>
<div>
<div class="m_-6367975140165080679m_-5441968509144498896m_-312155885434500526m_-4773659930361685905gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
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<div dir="ltr">
<div dir="ltr">
<div dir="ltr">
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<div><br>
</div>
<div><b style="font-size:12.8px"><font size="2"><br>
</font></b></div>
<div><b style="font-size:12.8px"><font size="2">Dr. Gibies George,</font></b><br>
</div>
<div><b style="font-size:12.8px"><font size="1">Project Scientist C,</font></b><br>
</div>
<div><b style="font-size:12.8px"><font size="1">Monsoon Mission,</font></b><br>
</div>
<div><b><font size="1">Indian Institute of
Tropical Meteorology,<br>
Dr. Homi Bhabha Road, </font></b></div>
<div><b><font size="1">NCL Post Office, </font></b></div>
<div><b><font size="1">Pashan, Pune
411008, India.<br>
Office Teleph : <a href="tel:020%202590%204423" value="+912025904423" target="_blank">+912025904423</a><br>
Office mail : <a href="mailto:gibies@tropmet.res.in" target="_blank">gibies@tropmet.res.in</a><br>
<br>
______________________________<wbr>______________<br>
Vettikuzhiyil House,<br>
Ezhakkaranadu South </font></b><b style="font-size:12.8px"><font size="1">Post Office,</font></b><b><font size="1"><br>
Puthencruz-682308, Kochi, India.<br>
Mobile number : <a href="tel:090285%2023910" value="+919028523910" target="_blank">+919028523910</a>,
<a href="tel:094204%2007392" value="+919420407392" target="_blank">+919420407392</a>, <br>
Personal mail : <a href="mailto:gibiesgeorge@gmail.com" target="_blank">gibiesgeorge@gmail.com</a><br>
<a href="http://sites.google.com/site/gibiesge/" target="_blank">http://sites.google.com/site/g<wbr>ibiesge/</a></font></b>
<div style="margin-left:80px">
<div><b><font size="1"><br>
</font></b></div>
</div>
<font color="#274e13"><b><span style="font-family:Arial;font-size:16px">______________________________<wbr>_________________________</span><br>
"Please do not print this e-mail
unless you really need. Because
every 3000 pages cost a tree. </b></font>
<div><b><font color="#274e13">Save
Trees, Save mother Earth."</font>
</b>
<div style="margin-left:80px"><span style="font-size:small"></span></div>
<div style="margin-left:80px"><span style="font-size:small"></span></div>
<font size="1"><br>
</font></div>
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