Re: [R] Averaging half hourly data to hourly
Hi Jenny, Date: Thu, 24 Jun 2010 09:45:10 +0100 From: Jennifer Wright j.wright...@sms.ed.ac.uk To: r-help@r-project.org Subject: [R] Averaging half hourly data to hourly Message-ID: 4c231b16.1080...@sms.ed.ac.uk Content-Type: text/plain; charset=ISO-8859-1; format=flowed Hi all, I have some time-series data in half hourly time steps and I want to be able to either average or sum the two half hours together into hours. Any help greatly appreciated. Thanks, Jenny -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. See period.apply and endpoints in the xts package: require(xts) (x - .xts(1:10,(1:10)*1800)) [,1] 1969-12-31 18:30:001 1969-12-31 19:00:002 1969-12-31 19:30:003 1969-12-31 20:00:004 1969-12-31 20:30:005 1969-12-31 21:00:006 1969-12-31 21:30:007 1969-12-31 22:00:008 1969-12-31 22:30:009 1969-12-31 23:00:00 10 period.apply(x, endpoints(x,hours), sum) [,1] 1969-12-31 18:30:001 1969-12-31 19:30:005 1969-12-31 20:30:009 1969-12-31 21:30:00 13 1969-12-31 22:30:00 17 1969-12-31 23:00:00 10 period.apply(x, endpoints(x,hours), mean) [,1] 1969-12-31 18:30:00 1.0 1969-12-31 19:30:00 2.5 1969-12-31 20:30:00 4.5 1969-12-31 21:30:00 6.5 1969-12-31 22:30:00 8.5 1969-12-31 23:00:00 10.0 Best, -- Joshua Ulrich FOSS Trading: www.fosstrading.com __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Averaging half hourly data to hourly
Hi all, I have some time-series data in half hourly time steps and I want to be able to either average or sum the two half hours together into hours. Any help greatly appreciated. Thanks, Jenny -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Averaging half hourly data to hourly
See ?aggregate Cheers J On Thu, Jun 24, 2010 at 10:45 AM, Jennifer Wright j.wright...@sms.ed.ac.uk wrote: Hi all, I have some time-series data in half hourly time steps and I want to be able to either average or sum the two half hours together into hours. Any help greatly appreciated. Thanks, Jenny -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control tel : +32 9 264 59 87 joris.m...@ugent.be --- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
