<div dir="ltr"><div>A very simple exponential fit function is attached. A test driver is also provided. Both were recently provided in an ncl-talk response to a query. You will have to develop your own exponential fit if you want something more sophisticated.<br><br></div><div>%> ncl exponential_curve_fit.ncl<br></div><div><br></div>Good Luck<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jun 27, 2017 at 9:59 AM, S Br <span dir="ltr"><<a href="mailto:sbr.climate@gmail.com" target="_blank">sbr.climate@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><div dir="ltr"><span style="font-size:12.8px">Hi,</span><div style="font-size:12.8px">Thanks for your reply. I will try to use these function.</div><div style="font-size:12.8px">I understood you have suggested the polynomial fit function. Is there any 'exponential fit' function available to remove the non-linear trend.</div><div style="font-size:12.8px"><br></div><div style="font-size:12.8px">SB</div></div></span><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Tue, Jun 27, 2017 at 3:09 PM, Dennis Shea <span dir="ltr"><<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>></span> wrote:<br></span><div><div class="h5"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>There is no explicit function to remove some unknown non-linear response.<br><br>You must ascertain (eg: eye-ball) the 'shape' of the non-linear response and use a function: eg<br> <a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/lspoly_n.shtml" target="_blank">http://www.ncl.ucar.edu/Docume<wbr>nt/Functions/Built-in/lspoly_n<wbr>.shtml</a><br></div>to generate some baseline. You can remove the non-linear response via (data-lspoly)<br></div>Note: you should plot the output from lspoly_n to make sure it is appropriate.<br><div><div><br>An example of using lspoly is here:<br><a href="http://www.ncl.ucar.edu/Applications/regress.shtml#ex6" target="_blank">http://www.ncl.ucar.edu/Applic<wbr>ations/regress.shtml#ex6</a><br><br><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="m_5505802069574204480h5">On Mon, Jun 26, 2017 at 10:20 AM, SBR climate <span dir="ltr"><<a href="mailto:sbr.climate@gmail.com" target="_blank">sbr.climate@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="m_5505802069574204480h5"><div dir="ltr">Hi NCL users,<div>I have generated an area averaged time series where the data is having non-linear trend.Is there any function available to to remove the trend from the time-series having non-linear trend.</div><div><br></div><div>Thanks</div><div>SB</div></div>
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