cut.Date and cut.POSIXt problem
By the way, it would be nice if the breaks argument accepted the word "quarter" directly since its quite a common break to need when using dates. On Tue, Mar 18, 2008 at 2:29 PM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
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
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