[R] convert to chron objects

[Gabor Grothendieck]

[I had some emails problems so I am sending this again.  Sorry
if you get it twice.]

On 7/13/05, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
> 
> 
> On 7/13/05, Young Cho <iidn01 at yahoo.com> wrote: 
> > Hi,
> > 
> > I have a column of a dataframe which has time stamps
> > like:
> > 
> > > eh$t[1]
> > [1] 06/05/2005 01:15:25 
> > 
> > and was wondering how to convert it to chron variable.
> > Thanks a lot.
>  
> 
> 
>  
> 
Try this:
 
# test data frame eh containing a factor variable t
eh <- data.frame(t = c("06/05/2005 01:15:25", "06/07/2005 01:15:25"))
 
# substring converts factor to character and extracts substring
chron(dates = substring(eh$t, 1, 10), times = substring(eh$t, 12))
 
See ?chron for more info.  There is an article on dates in
R News 4/1 and although it does not specifically answer this
question it may be useful with chron and also provides a 
reference to more chron info elsewhere.