For version 2.3-30 of chron which just appeared on CRAN this can be simplified to:
library(chron) tt <- times(0:47/48) tt chron("1/1/09", tt) # no rep needed On Mon, Feb 16, 2009 at 6:04 AM, Gabor Grothendieck <ggrothendi...@gmail.com> wrote: > Try this (and see R News 4/1 for more). > >> library(chron) >> tt <- times(0:47/48) >> tt > [1] 00:00:00 00:30:00 01:00:00 01:30:00 02:00:00 02:30:00 03:00:00 > 03:30:00 04:00:00 04:30:00 05:00:00 05:30:00 06:00:00 06:30:00 > 07:00:00 07:30:00 > [17] 08:00:00 08:30:00 09:00:00 09:30:00 10:00:00 10:30:00 11:00:00 > 11:30:00 12:00:00 12:30:00 13:00:00 13:30:00 14:00:00 14:30:00 > 15:00:00 15:30:00 > [33] 16:00:00 16:30:00 17:00:00 17:30:00 18:00:00 18:30:00 19:00:00 > 19:30:00 20:00:00 20:30:00 21:00:00 21:30:00 22:00:00 22:30:00 > 23:00:00 23:30:00 > >> chron(rep("1/1/09", length = length(tt)), tt) > [1] (01/01/09 00:00:00) (01/01/09 00:30:00) (01/01/09 01:00:00) > (01/01/09 01:30:00) (01/01/09 02:00:00) (01/01/09 02:30:00) (01/01/09 > 03:00:00) > [8] (01/01/09 03:30:00) (01/01/09 04:00:00) (01/01/09 04:30:00) > (01/01/09 05:00:00) (01/01/09 05:30:00) (01/01/09 06:00:00) (01/01/09 > 06:30:00) > [15] (01/01/09 07:00:00) (01/01/09 07:30:00) (01/01/09 08:00:00) > (01/01/09 08:30:00) (01/01/09 09:00:00) (01/01/09 09:30:00) (01/01/09 > 10:00:00) > [22] (01/01/09 10:30:00) (01/01/09 11:00:00) (01/01/09 11:30:00) > (01/01/09 12:00:00) (01/01/09 12:30:00) (01/01/09 13:00:00) (01/01/09 > 13:30:00) > [29] (01/01/09 14:00:00) (01/01/09 14:30:00) (01/01/09 15:00:00) > (01/01/09 15:30:00) (01/01/09 16:00:00) (01/01/09 16:30:00) (01/01/09 > 17:00:00) > [36] (01/01/09 17:30:00) (01/01/09 18:00:00) (01/01/09 18:30:00) > (01/01/09 19:00:00) (01/01/09 19:30:00) (01/01/09 20:00:00) (01/01/09 > 20:30:00) > [43] (01/01/09 21:00:00) (01/01/09 21:30:00) (01/01/09 22:00:00) > (01/01/09 22:30:00) (01/01/09 23:00:00) (01/01/09 23:30:00) > > > On Mon, Feb 16, 2009 at 5:00 AM, Suresh_FSFM <suresh.ghals...@gmail.com> > wrote: >> >> Dear R-Experts, >> >> seek your help. >> >> There are two parts I want to deal with. >> 1) >> I want to create a time interval of say, 30 minutes starting from "00:00:00" >> hrs >> Thus at the end, I want to create sequence: >> 00:00:00 >> 00:30:00 >> 01:00:00 >> 01:30:00 >> .. >> .. >> How to do so ? >> Later, I want to change the time-increment value in a variable and changing >> the value of this variable, I would like to create new sequence with that >> time increment. How to use "seq()" correctly? >> >> 2) >> I have a date stored in one variable. Say "2009-01-01" >> How can I combine this date with each time interval in the first part? Will >> concatenate work? >> so at the end, I would like to have: >> >> 2009-01-01 00:00:00 >> 2009-01-01 00:30:00 >> 2009-01-01 01:00:00 >> 2009-01-01 01:30:00 >> ... >> ... >> >> Thank you in advance. >> >> >> >> >> >> >> -- >> View this message in context: >> http://www.nabble.com/How-to-create-sequence-of-constant-time-interval-tp22034441p22034441.html >> Sent from the R help mailing list archive at Nabble.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-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.