Read the docs. POSIXlt is a list of 9 elements. Each element length is
what you think it should be returning. That is not correct.
?POSIXlt
Details:
There are two basic classes of date/times. Class '"POSIXct"'
represents the (signed) number of seconds since the beginning of
1970 as a numeric vector. Class '"POSIXlt"' is a named list of
vectors representing
> unclass(as.POSIXlt(as.POSIXlt('2007-01-01')+1:11))
$sec
[1] 1 2 3 4 5 6 7 8 9 10 11
$min
[1] 0 0 0 0 0 0 0 0 0 0 0
$hour
[1] 0 0 0 0 0 0 0 0 0 0 0
$mday
[1] 1 1 1 1 1 1 1 1 1 1 1
$mon
[1] 0 0 0 0 0 0 0 0 0 0 0
$year
[1] 107 107 107 107 107 107 107 107 107 107 107
$wday
[1] 1 1 1 1 1 1 1 1 1 1 1
$yday
[1] 0 0 0 0 0 0 0 0 0 0 0
$isdst
[1] 0 0 0 0 0 0 0 0 0 0 0
attr(,"tzone")
[1] "" "CST" "CDT"
Jeff
On Wed, Jan 28, 2009 at 4:15 PM, <twoutop...@gmail.com> wrote:
> The length() of a POSIXlt object is given as 9 regardless of the actual
> length. For example:
>
>> make.date.time
> function (year=c(2006,2006),month=c(8,8),day=2:5,hour=13,minute=45)
> {# convert year, etc., into POSIXlt object
> #
> d=as.character(make.date(year,month,day))
> t=paste(hour,minute,sep=":")
> as.POSIXlt(paste(d,t))
> }
>> t=make.date.time()
>> t
> [1] "2006-08-02 13:45:00" "2006-08-03 13:45:00" "2006-08-04 13:45:00"
> [4] "2006-08-05 13:45:00"
>> length(t)
> [1] 9
>> t[1]
> [1] "2006-08-02 13:45:00"
>> length(t[1])
> [1] 9
>
>
>
> --
> blog.sethroberts.net
> www.shangriladiet.com
> boards.shangriladiet.com
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>
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--
Jeffrey Ryan
jeffrey.r...@insightalgo.com
ia: insight algorithmics
www.insightalgo.com
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