R help - Feb 2008 - When I cbind the POSIXct gets lost

I would like to create a new dataframe from the DateTime column of an
existing dataframe and a numeric vector.  When I do cbind(x[,1], y) the
result is:

[1,] 1199370600     12.500
[2,] 1199371200     69.375
[3,] 1199371800     23.750

where the first column you see used to look like:
 "2008-01-03 08:30:00 Central Standard Time"
 "2008-01-03 08:40:00 Central Standard Time"
 "2008-01-03 08:50:00 Central Standard Time"

How do I keep the DateTime from getting converted?  I've tried as.POSIXct()
to convert it back (no luck).   


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Use data.frame:
> tt <- ISOdate(2000, 1:3, 1)
> cbind(tt, tt)
            tt        tt
[1,] 946728000 946728000
[2,] 949406400 949406400
[3,] 951912000 951912000
> data.frame(tt, tt)
                   tt                tt.1
1 2000-01-01 12:00:00 2000-01-01 12:00:00
2 2000-02-01 12:00:00 2000-02-01 12:00:00
3 2000-03-01 12:00:00 2000-03-01 12:00:00


On Feb 8, 2008 4:59 PM, Ken Spriggs <ksspriggs at gmail.com>
wrote:
>
> I would like to create a new dataframe from the DateTime column of an
> existing dataframe and a numeric vector.  When I do cbind(x[,1], y) the
> result is:
>
> [1,] 1199370600     12.500
> [2,] 1199371200     69.375
> [3,] 1199371800     23.750
>
> where the first column you see used to look like:
>  "2008-01-03 08:30:00 Central Standard Time"
>  "2008-01-03 08:40:00 Central Standard Time"
>  "2008-01-03 08:50:00 Central Standard Time"
>
> How do I keep the DateTime from getting converted?  I've tried
as.POSIXct()
> to convert it back (no luck).
>
>
> --
> View this message in context:
http://www.nabble.com/When-I-cbind-the-POSIXct-gets-lost-tp15364786p15364786.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

Ken,

not sure, but you might try

data.frame(whatever1=x[,1],whatever2=y)

this should maintain the classes of the vectors. I'm guessing that y
and x are of different classes. From ?cbind:

"For the default method, a matrix combining the ... argument.  The
type of a matrix result determined from the highest type of any of the
inputs in the hierarchy raw < logical < integer < real < complex
<
character < list "

Matt


On Feb 8, 2008 2:59 PM, Ken Spriggs <ksspriggs at gmail.com>
wrote:
>
> I would like to create a new dataframe from the DateTime column of an
> existing dataframe and a numeric vector.  When I do cbind(x[,1], y) the
> result is:
>
> [1,] 1199370600     12.500
> [2,] 1199371200     69.375
> [3,] 1199371800     23.750
>
> where the first column you see used to look like:
>  "2008-01-03 08:30:00 Central Standard Time"
>  "2008-01-03 08:40:00 Central Standard Time"
>  "2008-01-03 08:50:00 Central Standard Time"
>
> How do I keep the DateTime from getting converted?  I've tried
as.POSIXct()
> to convert it back (no luck).
>
>
> --
> View this message in context:
http://www.nabble.com/When-I-cbind-the-POSIXct-gets-lost-tp15364786p15364786.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Matthew C Keller
Asst. Professor of Psychology
University of Colorado at Boulder
www.matthewckeller.com