[Rd] cut.Date and cut.POSIXt problem

[Gabor Grothendieck]

I am using

[1] "R version 2.6.2 alpha (2008-01-26 r44181)"

and also get the same under:

"R version 2.7.0 Under development (unstable) (2008-03-13 r44752)"

On Tue, Mar 18, 2008 at 2:09 PM, Roger D. Peng <rpeng at jhsph.edu> wrote:
> Seems it did work as advertised in R 2.6.0 but is still broken in R-devel.  Will
> take a look.
>
> -roger
>
>
> Gabor Grothendieck wrote:
> > cut.Date and cut.POSIXt indicate that the breaks argument
> > can be an integer followed by a space followed by "year", etc.
> > but it seems the integer is ignored.
> >
> > For example, I assume that breaks = "3 months" is supposed
> > to cut it into quarters but, in fact, it cuts it into months as if
> > 3 had not been there.
> >
> >> d <- seq(Sys.Date(), length = 12, by = "month")
> >> cut(d, "3 months")
> >  [1] 2008-03-01 2008-04-01 2008-05-01 2008-06-01 2008-07-01 2008-08-01
> > 2008-09-01 2008-10-01 2008-11-01 2008-12-01 2009-01-01 2009-02-01
> > Levels: 2008-03-01 2008-04-01 2008-05-01 2008-06-01 2008-07-01
> > 2008-08-01 2008-09-01 2008-10-01 2008-11-01 2008-12-01 2009-01-01
> > 2009-02-01
> >> cut(as.POSIXct(d), "3 months")
> >  [1] 2008-03-01 2008-04-01 2008-05-01 2008-06-01 2008-07-01 2008-08-01
> > 2008-09-01 2008-10-01 2008-11-01 2008-12-01 2009-01-01 2009-02-01
> > Levels: 2008-03-01 2008-04-01 2008-05-01 2008-06-01 2008-07-01
> > 2008-08-01 2008-09-01 2008-10-01 2008-11-01 2008-12-01 2009-01-01
> > 2009-02-01
> >> cut(as.POSIXlt(d), "3 months")
> >  [1] 2008-03-01 2008-04-01 2008-05-01 2008-06-01 2008-07-01 2008-08-01
> > 2008-09-01 2008-10-01 2008-11-01 2008-12-01 2009-01-01 2009-02-01
> > Levels: 2008-03-01 2008-04-01 2008-05-01 2008-06-01 2008-07-01
> > 2008-08-01 2008-09-01 2008-10-01 2008-11-01 2008-12-01 2009-01-01
> > 2009-02-01
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
>
> --
> Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/
>