length of POSIXlt object (PR#13482)

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

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



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Jeffrey Ryan
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ia: insight algorithmics
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