I think hours should have a comparison tolerance. Try:
hours(x+1e-10)
as a workaround.
On 9/20/06, Glen A Sargeant <glen_sargeant at usgs.gov>
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
>
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