What exactly is the purported bug here? It seems to me that the cuts
are correct and the behaiour is as documented, but that you were not
expecting empty levels. If that bothers you, use
cut(x, breaks= "quarter")[,drop=TRUE]
On Mon, 21 Dec 2009, shmu...@googlemail.com wrote:
Full_Name: Qing Xia
Version: 2.10.0
OS: Windows XP
Submission from: (NULL) (213.71.23.233)
I find, when I use "cut" function to cut date-time objects based on breaks =
"quarter", there exists a problem. It means, if the date-time has "JJJJ-MM-30"
or "JJJJ-MM-31", then "cut" runs not correctly, it gives wrong levels. Detail
can be found in the following R-Output:
1. correct Output levels, if there is no date-time "JJJJ-MM-30" or "JJJJ-MM-31"
x<- as.Date(c("2009-03-21","2009-03-24"))
cut(x, breaks= "quarter")
[1] 2009-01-01 2009-01-01
Levels: 2009-01-01
2. wrong Output levels, if there exists date-time "JJJJ-MM-30" or "JJJJ-MM-31"
x<- as.Date(c("2009-03-21","2009-03-30"))
cut(x, breaks= "quarter")
[1] 2009-01-01 2009-01-01
Levels: 2009-01-01 2009-04-01
x<- as.Date(c("2009-03-21","2009-03-31"))
cut(x, breaks= "quarter")
[1] 2009-01-01 2009-01-01
Levels: 2009-01-01 2009-04-01
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Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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