R help - Feb 2008 - How to make a vector/list/array of POSIXlt object?

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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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
> _________________________________________________________________
> [[elided Hotmail spam]]
>
>        [[alternative HTML version deleted]]
>
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