cut.POSIXt problem with breaks= "quarter" (PR#14162)
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, shmunde at 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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