The reason is in the ?strptime under value: 'strptime' turns character representations into an object of class '"POSIXlt"'. The timezone is used to set the 'isdst' component and to set the '"tzone"' attribute if 'tz != ""'.
And POSIXlt is a list of length 9. HTH Jeff On Sun, Aug 9, 2009 at 10:35 AM, Gabor Grothendieck<ggrothendi...@gmail.com> wrote: > Try this to see its components: > >> str(unclass(xd)) > List of 9 > $ sec : num [1:6] 0 0 0 0 0 0 > $ min : int [1:6] 0 0 0 0 0 0 > $ hour : int [1:6] 0 0 0 0 0 0 > $ mday : int [1:6] 9 31 12 12 30 30 > $ mon : int [1:6] 2 4 10 10 6 6 > $ year : int [1:6] 107 107 108 108 109 109 > $ wday : int [1:6] 5 4 3 3 4 4 > $ yday : int [1:6] 67 150 316 316 210 210 > $ isdst: int [1:6] 0 1 0 0 1 1 > > and read R News 4/1 for more. > > On Sun, Aug 9, 2009 at 10:20 AM, laurent<lgaut...@gmail.com> wrote: >> Dear List, >> >> >> I am having an issue with strptime (see below). >> I can reproduce it on R-2.8, R-2.9, and R-2.10-dev, I tempted to see >> either a bug or my misunderstanding (and then I just don't currently see >> where). >> >> # setup: >> x <- c("March 09, 2007", "May 31, 2007", "November 12, 2008", "November >> 12, 2008", "July 30, 2009", "July 30, 2009" ) >> >> # showing the problem >>> length(x) >> 6 >>> xd <- strptime(x, format = "%B %d, %Y") >>> length(xd) >> 9 >>> xd[1:9] >> [1] "2007-03-09" "2007-05-31" "2008-11-12" "2008-11-12" "2009-07-30" >> [6] "2009-07-30" NA NA NA >>> length(strptime(rep(x, 2), format="%B %d, %Y")) >> [1] 9 >>> strptime(rep(x, 2), format="%B %d, %Y")[1:12] >> [1] "2007-03-09" "2007-05-31" "2008-11-12" "2008-11-12" "2009-07-30" >> [6] "2009-07-30" "2007-03-09" "2007-05-31" "2008-11-12" "2008-11-12" >> [11] "2009-07-30" "2009-07-30 >> >> Any pointer would be appreciated. >> >> >> >> L. >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- Jeffrey Ryan jeffrey.r...@insightalgo.com ia: insight algorithmics www.insightalgo.com ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel