<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Joe,<div class=""><br class=""></div><div class="">Sorry for the 101st e-mail of the day. Would you have time after our EPAD coffee ends at ~2pm for a short chat?</div><div class=""><br class=""></div><div class="">— Mike<br class=""><div class=""><br class=""></div><div class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div><div style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""></div></div></div>
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<div><br class=""><blockquote type="cite" class=""><div class="">On Sep 16, 2020, at 12:00 PM, <a href="mailto:ncl-talk-request@mailman.ucar.edu" class="">ncl-talk-request@mailman.ucar.edu</a> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Send ncl-talk mailing list submissions to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><a href="mailto:ncl-talk@mailman.ucar.edu" class="">ncl-talk@mailman.ucar.edu</a><br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>https://mailman.ucar.edu/mailman/listinfo/ncl-talk<br class="">or, via email, send a message with subject or body 'help' to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>ncl-talk-request@mailman.ucar.edu<br class=""><br class="">You can reach the person managing the list at<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>ncl-talk-owner@mailman.ucar.edu<br class=""><br class="">When replying, please edit your Subject line so it is more specific<br class="">than "Re: Contents of ncl-talk digest..."<br class=""><br class=""><br class="">Today's Topics:<br class=""><br class=""> 1. Re: power spectrum of filtered dataset (Dennis Shea)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Tue, 15 Sep 2020 20:13:11 -0600<br class="">From: Dennis Shea <shea@ucar.edu><br class="">To: Edwin Marco <eigenge@gmail.com><br class="">Cc: ncl-talk <ncl-talk@mailman.ucar.edu><br class="">Subject: Re: [ncl-talk] power spectrum of filtered dataset<br class="">Message-ID:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><CAOF1d_6k4VNmieYn8Y3keCMO_tUm_5+i_evq8FnNngPyRgPOqQ@mail.gmail.com><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">ncl-talk has no idea what you have done. The series has * *pentad** [5-day]<br class="">temporal sampling. The plots have the frequency axis labeled<br class="">'cycles/month'.<br class=""><br class="">ncl 0> f = addfile("rainfall_pc_00000.nc","r")<br class="">ncl 1> ymd = cd_calendar(f->time,-2)<br class="">ncl 2> print(ymd)<br class=""><br class="">(0) 19810303<br class="">(1) 19810308<br class="">(2) 19810313<br class="">(3) 19810318<br class="">(4) 19810323<br class="">(5) 19810328<br class="">(6) 19810402<br class="">(7) 19810407<br class="">(8) 19810412<br class="">(9) 19810417<br class="">(10) 19810422<br class="">(11) 19810427<br class="">(12) 19810502<br class="">(13) 19810507<br class="">.<br class="">.<br class="">It is *your responsibility *[**not ncl-talk's**] to design a filter that<br class="">addresses the pentad time sampling to create a (say) 20-60 day filter.<br class="">ncl-talk's experience is that dealing with this type of issue leads to many<br class="">emails. We can no longer do that.<br class=""><br class="">Good Luck<br class=""><br class="">On Tue, Sep 15, 2020 at 6:43 AM Edwin Marco via ncl-talk <<br class="">ncl-talk@mailman.ucar.edu> wrote:<br class=""><br class=""><blockquote type="cite" class="">Dear ncl users,<br class=""><br class="">I am trying to prove whether I have correctly filtered my dataset by<br class="">plotting the power spectrum of the filtered data set.<br class=""><br class="">My approach:<br class="">firstly I have plotted the spectrum of the unfiltered data set (<br class="">rainfall_pc_00000.nc) using attached script<br class="">(plot_spectrum_unfiltered_data.ncl).<br class=""><br class="">Secondly, I decided to filter my dataset at 20-60 days.<br class=""><br class="">Thirdly; Using the Butterworth filtering technique, filtered the dataset (<br class="">rainfall_pc_00000.nc) at 20-60 days, and plot the spectrum of the<br class="">filtered dataset.<br class=""><br class="">Problem: After plotting the spectrum of the filtered dataset, I intended<br class="">to see all peaks out of 60-20days bandpass to disappear however it came the<br class="">opposite way.<br class=""><br class="">I have attached scripts, plots, and datasets for easy follow-up.<br class=""><br class="">Please help me know if my approach to proof whether I have correctly<br class="">filtered the datasets is correctly and then where I am getting wrong and<br class="">plot opposite results, contrary to the theory.<br class=""><br class="">Thanks<br class=""><br class="">Edwin<br class=""><br class=""><br class=""><br class="">_______________________________________________<br class="">ncl-talk mailing list<br class="">ncl-talk@mailman.ucar.edu<br class="">List instructions, subscriber options, unsubscribe:<br class="">https://mailman.ucar.edu/mailman/listinfo/ncl-talk<br class=""></blockquote>-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <https://mailman.ucar.edu/pipermail/ncl-talk/attachments/20200915/9a74aadd/attachment-0001.html><br class=""><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">ncl-talk mailing list<br class="">ncl-talk@mailman.ucar.edu<br class="">List instructions, subscriber options, unsubscribe:<br class="">https://mailman.ucar.edu/mailman/listinfo/ncl-talk<br class=""><br class="">------------------------------<br class=""><br class="">End of ncl-talk Digest, Vol 202, Issue 19<br class="">*****************************************<br class=""></div></div></blockquote></div><br class=""></div></body></html>