No, read ?difftime and look at as.double. There is a units parameter that you must set if you want predictable results. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity.
Alaios <ala...@yahoo.com> wrote: Do you mean something like that? as.double(diff(c(ISOdatetime(2011,6,1,11,59,1.09),ISOdatetime(2011,6,5,11,59,1.09))),length=20) [1] 345600 _____________________________________________ From: Jeff Newmiller <jdnew...@dcn.davis.ca.us> To: Alaios <ala...@yahoo.com>; jim holtman <jholt...@gmail.com> Cc: "R-help@r-project.org" <R-help@r-project.org> Sent: Monday, October 10, 2011 10:42 AM Subject: Re: [R] Handling Time in R Difftime doesn't "report" things. When you print it, it automatically selects an appropriate human-readable unit to display in, but that does not change its internal representation. If you must convert to seconds, you can do so using the as.double generic (as.double.difftime) with a units parameter. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. Alaios <ala...@yahoo.com> wrote: Thanks a lot. That helped. One thing now is to have the difftime(y,x) to always report seconds. There are times that there is a change in the day and thus the diff will report few days difference. How can it always report only seconds? I would like to thank you in advance for your help B.R Alex _____________________________________________ From: jim holtman <jholt...@gmail.com> Cc: "R-help@r-project.org" <R-help@r-project.org> Sent: Friday, October 7, 2011 5:34 PM Subject: Re: [R] Handling Time in R ?ISOdatetime > x <- ISOdatetime(2011,10,6,16,23,30.539) > str(x) POSIXct[1:1], format: "2011-10-06 16:23:30" > y <- ISOdatetime(2011,10,6,16,23,30.939) > difftime(y,x) Time difference of 0.3999999 secs > > Dear all, > I would like to ask your help regarding handling time stamps in R. I think > first I need a reference to read about their logic and how I should handle > them. > > For example, this is a struct I have > > > str(MyStruct$TimeStamps) > �num [1:100, 1:6] 2011 2011 2011 2011 2011 ... > > MyStruct$TimeStamps[1,] > [1] 2011.000�� 10.000��� 6.000�� 16.000�� 23.000�� > 30.539 > > the last field contains seconds.milliseconds. > > How I can for example make calculations with time stamps like see if the > MyStruct$TimeStamps[1,]-MyStruct$TimeStamps[2,] differ more than > 300millisecond, or 3 days have passed? > > I would like to thank you in advance for your suggestions > > B.R > Alex > > � � � �[[alternative HTML version deleted]] > > >_____________________________________________ > R-help@r-project.org mailing list< br />> > 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. > > -- Jim Holtman Data Munger Guru What is the problem that you are trying to solve? [[alternative HTML version deleted]] _____________________________________________ 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. [[alternative HTML version deleted]]
______________________________________________ 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.
