[R] How to make a vector/list/array of POSIXlt object?

[Gabor Grothendieck]

Normally one uses POSIXct rather than POSIXlt for storage.  See R News 4/1 for
more info on date and time classes.

On Feb 17, 2008 3:45 PM, Bo Zhou <bozhou1981 at hotmail.com> wrote:
>
> Hi Guys,
>
> I'm cooking up my time series code. I want a data frame with first column as timestamp in POSIXlt format.
>
> I hit on this the problem of how to create an array/list/vector of POSIXlt objects. Code is as follows
>
>
>
> > dtt=array(dim = 2)
> > t=as.POSIXlt( strptime("07/12/07 13:20:01", "%m/%d/%Y %H:%M:%S",tz="GMT"))
> > dtt
> [1] NA NA
> > t
> [1] "0007-07-12 13:20:01 GMT"
> > dtt[1]=t
> Warning message:
> In dtt[1] = t :
>  number of items to replace is not a multiple of replacement length
> > class(dtt)
> [1] "list"
> > class(t)
> [1] "POSIXt"  "POSIXlt"
> > unclass(t)
> $sec
> [1] 1
>
> $min
> [1] 20
>
> $hour
> [1] 13
>
> $mday
> [1] 12
>
> $mon
> [1] 6
>
> $year
> [1] -1893
>
> $wday
> [1] 4
>
> $yday
> [1] 192
>
> $isdst
> [1] 0
>
> attr(,"tzone")
> [1] "GMT"
>
>
>
> Seems like POSIXlt is matrix in this case.
>
> Any suggestions?
>
> Cheers,
>
> B
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