I think hours should have a comparison tolerance. Try: hours(x+1e-10)
as a workaround. On 9/20/06, Glen A Sargeant <[EMAIL PROTECTED]> wrote: > I encountered surprising (to me, at least) behavior while using 'hours()' > in package 'chron.' I will be grateful if someone can point out my error > or provide an explanation and intuitive solution (I suppose I could > convert chron to a character vector and use substring, but I deal mostly > with newbies and kludgy approaches don't inspire much confidence). > > I used 2.3.0 to construct the dataframe below. > > 1) 'date.char' is a character vector > > 2) 'time.char' is a character vector > > 3) 'chron' was created by > >chron(dates(date.char),times(time.char)) > > 4) hours were extracted with > >hours(chron). > > 5) Note that the hours used to construct 'chron' do not match the hours > extracted with 'hours()' when minutes and seconds are "00:00." > > date.char time.char chron hour > 1 09/20/06 00:00:00 (09/20/06 00:00:00) 0 > 2 09/20/06 01:00:00 (09/20/06 01:00:00) 0 > 3 09/20/06 02:00:00 (09/20/06 02:00:00) 2 > 4 09/20/06 03:00:00 (09/20/06 03:00:00) 3 > 5 09/20/06 04:00:00 (09/20/06 04:00:00) 3 > 6 09/20/06 05:00:00 (09/20/06 05:00:00) 5 > 7 09/20/06 06:00:00 (09/20/06 06:00:00) 6 > 8 09/20/06 07:00:00 (09/20/06 07:00:00) 6 > 9 09/20/06 08:00:00 (09/20/06 08:00:00) 8 > 10 09/20/06 09:00:00 (09/20/06 09:00:00) 9 > 11 09/20/06 10:00:00 (09/20/06 10:00:00) 9 > 12 09/20/06 11:00:00 (09/20/06 11:00:00) 11 > 13 09/20/06 12:00:00 (09/20/06 12:00:00) 12 > 14 09/20/06 13:00:00 (09/20/06 13:00:00) 12 > 15 09/20/06 14:00:00 (09/20/06 14:00:00) 14 > 16 09/20/06 15:00:00 (09/20/06 15:00:00) 15 > 17 09/20/06 16:00:00 (09/20/06 16:00:00) 15 > 18 09/20/06 17:00:00 (09/20/06 17:00:00) 17 > 19 09/20/06 18:00:00 (09/20/06 18:00:00) 18 > 20 09/20/06 19:00:00 (09/20/06 19:00:00) 18 > 21 09/20/06 20:00:00 (09/20/06 20:00:00) 20 > 22 09/20/06 21:00:00 (09/20/06 21:00:00) 21 > 23 09/20/06 22:00:00 (09/20/06 22:00:00) 21 > 24 09/20/06 23:00:00 (09/20/06 23:00:00) 23 > > This behavior is problematic if one wants to extract hours and use them to > group data. > > Regards, > > Glen Sargeant > > ______________________________________________ > [email protected] 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. > ______________________________________________ [email protected] 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.
