Since you are using GRIB formatted data, this is very easy to do.� The question remains what time interval you want.� In your initial email you said you wanted data only at 12 PM.� However, in subsequent emails, you said you wanted to use an interval of 2.� Given a time interval of 6 hrs in your data, those time increments do not match.� It's easy to make changes based on what you want, though.<br>
<br>Anyway, everything you need to do involves changing the TDEF line of your control file:<br><br>tdef 1460 linear 00Z01jan2009 6hr<br><br>This controls the time interval of the data you will see.� That last entry is the interval.� Change it to 12hr or 24hr/1dy depending on what time interval you want.� Also you'll want to change the second entry, 1460, which is the number of time slices you want to view.� You'll either divide that by 2 or 4 depending on your time interval.� Finally, if you use a 24 hour interval, make sure to change the initial time string (currently 00Z01JAN2009) to the correct UTC hour.� Let me know if you need clarification or any further examples.� You can find documentation on this at <a href="http://www.iges.org/grads/gadoc/descriptorfile.html#TDEF">http://www.iges.org/grads/gadoc/descriptorfile.html#TDEF</a>.<br>
<br>Jeff<br><br><div class="gmail_quote">On Tue, Jan 15, 2013 at 2:05 PM, Sagar Parajuli <span dir="ltr"><<a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Jeff,<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Attached is my ctl file. <u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u>�<u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Sincerely,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u>�<u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#e36c0a">Sagar Prasad Parajuli<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#e36c0a">Graduate Student/Research Assistant<u></u><u></u></span></p>
<div class="im"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#e36c0a">University of Texas at Austin<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#e36c0a">Jackson School of Geosciences<u></u><u></u></span></p>
</div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#e36c0a">1 University Station C1100, JGB 5.322<br>Austin, TX 78712<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#e36c0a">Contact: <a href="mailto:psagar@utexas.edu" target="_blank"><span style="color:#e36c0a">psagar@utexas.edu</span></a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#e36c0a">Cell: 512 965 4093<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><img src="" alt="texas-longhorn-logo" border="0" height="40" width="80"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u>�<u></u></span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:gradsusr-bounces@gradsusr.org" target="_blank">gradsusr-bounces@gradsusr.org</a> [mailto:<a href="mailto:gradsusr-bounces@gradsusr.org" target="_blank">gradsusr-bounces@gradsusr.org</a>] <b>On Behalf Of </b>Jeff Duda<br>
<b>Sent:</b> Tuesday, January 15, 2013 1:06 PM<br><b>To:</b> GrADS Users Forum<br><b>Subject:</b> Re: [gradsusr] setting time with intervals<u></u><u></u></span></p><div><div class="h5"><p class="MsoNormal"><u></u>�<u></u></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Sagar,<br>What does your control file look like?� Can you send it to me please?<br><br>Jeff<u></u><u></u></p><div><p class="MsoNormal">On Tue, Jan 15, 2013 at 12:23 PM, Sagar P Parajuli <<a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Hi Jeff<br>I need to plot and print those extracted data. I know how to print it but I want to know how to specify the time interval required. The code I am using is:<br>open ERA.INTERIM.SFC.ctl<br>set lat 31.4<br>
set lon 61.3<br>set t 1 last (It will print values pertaining to all t but I want to specify an interval of 2).<br>set gxout print<br>set prnopts %g 1 1<br>d mag(no10usfc,no10vsfc)<br><br>How can I specify the required time interval for t?<br>
<br>thank you,<br><br>-Sagar<u></u><u></u></p><div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><br><br><u></u><u></u></p><div><p class="MsoNormal">On Tue, Jan 15, 2013 at 10:03 AM, Jeff Duda <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">What do you want to do with the data?� Do you want to make plots in Grads or just extract the data?� If it's the latter, then you don't really even need to use Grads.<span style="color:#888888"><br>
<br>Jeff</span><u></u><u></u></p><div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u>�<u></u></p><div><p class="MsoNormal">On Tue, Jan 15, 2013 at 8:47 AM, Sagar P Parajuli <<a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Hi Jeff,<br>I think I didn't clarify my question. I am writing control file for extracting some wind speed data corresponding to particular time of a day. What I could do in grads is:<br>�set t 1 last <br>
But I want to do this skipping certain values eg. I want values corresponding to t = 1, 3, 5, 7, 9, etc (i.e. with certain interval). So, I need to skip some data and only extract those datas.<br>How can I do this?<br><br>
<br>Thank you so much again.<br><br><br><br>Sagar<u></u><u></u></p><div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><br><br><u></u><u></u></p><div><p class="MsoNormal">On Mon, Jan 14, 2013 at 11:13 PM, Jeff Duda <<a href="mailto:jeffduda319@gmail.com" target="_blank">jeffduda319@gmail.com</a>> wrote:<u></u><u></u></p>
<p class="MsoNormal">Time interval is specified in the control file used to open the data file. �However, if you used xdfopen or sdfopen, there may be a different way to determine the time interval. �In those cases, you should be able to find it by dumping the contents. �If your data are in netCDF format, for example, you could use ncdump -h (data file) to find out.<u></u><u></u></p>
<div><p class="MsoNormal"><u></u>�<u></u></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt">Jeff Duda<u></u><u></u></p><div><div><div><p class="MsoNormal">On Mon, Jan 14, 2013 at 9:47 PM, Sagar P Parajuli <<a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a>> wrote:<u></u><u></u></p>
</div></div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><div><div><p class="MsoNormal" style="margin-bottom:12.0pt">Hi all,<br>I need to extract wind speed data at a particular time (12:00 pm only) everyday from the 6 hourly data of one year. So I need to set time as,<br>
t = 1, 1460, 2 (start, end, interval). How is the time interval specified in grads? <br><br>Thank you very much for your help. <br><br><u></u><u></u></p><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u>�<u></u></p>
<p><b><span style="color:#e36c0a">Sagar P. Parajuli</span></b><u></u><u></u></p><p><span style="color:#e36c0a">Graduate Research Assistant</span><u></u><u></u></p><p><span style="color:#e36c0a">The University of Texas at Austin<br>
Jackson School of Geosciences<br>e-mail: <a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a></span><u></u><u></u></p><p class="MsoNormal"><span style="color:#e36c0a">Contact: <a href="tel:%2B1%20512%20965%204093" target="_blank">+1 512 965 4093</a></span> <u></u><u></u></p>
</div></div><p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>gradsusr mailing list<br><a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><u></u><u></u></p></blockquote></div><p class="MsoNormal"><span style="color:#888888"><br><br clear="all">
<u></u><u></u></span></p><div><p class="MsoNormal"><span style="color:#888888"><u></u>�<u></u></span></p></div><p class="MsoNormal"><span style="color:#888888">-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>
Center for Analysis and Prediction of Storms</span><u></u><u></u></p></div><p class="MsoNormal" style="margin-bottom:12.0pt"><br>_______________________________________________<br>gradsusr mailing list<br><a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><u></u><u></u></p></div><p class="MsoNormal"><br><br clear="all"><br>-- <u></u><u></u></p></div></div>
<p class="MsoNormal">Best regards,<u></u><u></u></p><div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><u></u>�<u></u></p><p><b><span style="color:#e36c0a">Sagar P. Parajuli</span></b><u></u><u></u></p><p><span style="color:#e36c0a">Graduate Research Assistant</span><u></u><u></u></p>
<p><span style="color:#e36c0a">The University of Texas at Austin<br>Jackson School of Geosciences<br>e-mail: <a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a></span><u></u><u></u></p><p class="MsoNormal">
<span style="color:#e36c0a">Contact: <a href="tel:%2B1%20512%20965%204093" target="_blank">+1 512 965 4093</a></span> <u></u><u></u></p></div></div><p class="MsoNormal" style="margin-bottom:12.0pt"><br>_______________________________________________<br>
gradsusr mailing list<br><a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br><a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><u></u><u></u></p>
</div><p class="MsoNormal"><br><br clear="all"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<u></u><u></u></p></div></div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>_______________________________________________<br>gradsusr mailing list<br><a href="mailto:gradsusr@gradsusr.org" target="_blank">gradsusr@gradsusr.org</a><br><a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><u></u><u></u></p>
</div><p class="MsoNormal"><br><br clear="all"><br>-- <u></u><u></u></p><p class="MsoNormal" style="margin-bottom:12.0pt">Best regards,<u></u><u></u></p><p><b><span style="color:#e36c0a">Sagar P. Parajuli</span></b><u></u><u></u></p>
<p><span style="color:#e36c0a">Graduate Research Assistant</span><u></u><u></u></p><p><span style="color:#e36c0a">The University of Texas at Austin<br>Jackson School of Geosciences<br>e-mail: <a href="mailto:psagar@utexas.edu" target="_blank">psagar@utexas.edu</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#e36c0a">Contact: +1 512 965 4093</span> <u></u><u></u></p></div></div><p class="MsoNormal" style="margin-bottom:12.0pt"><br>_______________________________________________<br>gradsusr mailing list<br>
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</div><p class="MsoNormal"><br><br clear="all"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<u></u><u></u></p></div></div>
</div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br>