<div dir="ltr"><div>A question was just asked yesterday. Please read ncl-talk.<br></div><div><br></div><div><br></div><div><div>NCL has  several <a href="https://www.ncl.ucar.edu/Document/Functions/list_alpha.shtml" target="_blank"><b>functions</b></a> for computing derivatives (gradients).</div><div>  <br></div><div>The spherical harmonic<b> </b>based functions are highly accurate but can only used with global grids and no missing values.<br></div><div><br></div><div>   <a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/gradsg.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Document/Functions/Built-in/gradsg.shtml</b></a></div><div>   <a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/gradsf.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Document/Functions/Built-in/gradsf.shtml</b></a></div><div>   <a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/grad_latlon_cfd.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Document/Functions/Contributed/grad_latlon_cfd.shtml</b></a></div><div>   <a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff.shtml</b></a></div><div><b>   <a href="https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml" target="_blank">https://www.ncl.ucar.edu/Document/Functions/Built-in/center_finite_diff_n.shtml</a><br></b></div><div><br></div><div>Some Examples:<b> </b><a href="https://www.ncl.ucar.edu/Applications/gradients.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Applications/gradients.shtml</b></a> <br></div><div>===<br></div><div>If you have NCL 6.6.2, you could also use the following with <b>opt=1</b></div><div><br></div><div><a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform.shtml</b></a></div><div><b>or</b><br></div><div><b><a href="https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform.shtml" target="_blank"><b>https://www.ncl.ucar.edu/Document/Functions/Contributed/shear_stretch_deform_cfd.shtml</b></a></b></div><div><div id="m_-1493749200818414188gmail-:56t"><img src="https://ssl.gstatic.com/ui/v1/icons/mail/images/cleardot.gif"></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Nov 14, 2019 at 10:15 PM Debashis Paul via ncl-talk <<a href="mailto:ncl-talk@ucar.edu" target="_blank">ncl-talk@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"><div dir="ltr"><div class="gmail_default" style="font-family:monospace,monospace">I want to calculate the sst front which is given by:</div><div class="gmail_default" style="font-family:monospace,monospace"> ((dsst/dx)^2 + (dsst/dy)^2)^1/2.</div><div class="gmail_default" style="font-family:monospace,monospace">So is their any function so to calculate derivatives.</div><div class="gmail_default" style="font-family:monospace,monospace"><br></div><div class="gmail_default" style="font-family:monospace,monospace">DP</div><div class="gmail_default" style="font-family:monospace,monospace">************************************</div><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><b><i><font face="monospace" color="#0000ff">Debashis Paul</font></i></b></div><div dir="ltr"><b><i><font face="monospace" color="#0000ff">Research Scholar,NIT-RKL<br></font></i></b><div><b><i><font face="monospace" color="#0000ff">Ph:+916002713628</font></i></b></div><div><b><i><font face="monospace" color="#0000ff">E-mail: <a href="mailto:Debgeo668@gmail.com" target="_blank">Debgeo668@gmail.com</a></font></i></b></div></div></div></div></div></div></div></div></div>
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