cut.POSIXct problem
This works in R 1.7.1: please upgrade. [That's assuming that your sequence actually covers the data: you need to go beyond max(cas.param) to be sure, and it looks to me that with right=FALSE and include.lowest-FALSE the breaks never will cover the data.]
On Tue, 17 Jun 2003, Petr Pikal wrote:
Dear all I would like to aggregate a data frame in a three minute interval. I have a time vector:
str(cas.param)
`POSIXct', format: chr [1:181] "2003-06-12 09:00:00" "2003-06-12 09:01:00" "2003-06-12 09:02:00" and I want to turn it into a factor by cut. It works if I want to break it in let say hours
str(cut(cas.param,breaks="hour"))
Factor w/ 3 levels "2003-06-12 ..",..: 1 1 1 1 1 1 1 1 1 1 . But if i tried to do similar task but to construct three minutes intervals with a vector of cut points it gives me an error
cut(cas.param,breaks=seq(min(cas.param),max(cas.param), by="3 mins"))
Error in sort(breaks) : `x' must be atomic however
str(seq(min(cas.param),max(cas.param), by="3 mins"))
`POSIXct', format: chr [1:61] "2003-06-12 09:00:00" "2003-06-12 09:03:00" "2003-06-12 09:06:00" works. So it is definitely my lack of understanding how to implement a vector of cut points (constructed by seq()), to break parameter of cut() function. Please can you give me any hints? R 1.7.0, Windows NT Thanks a lot Petr Pikal petr.pikal at precheza.cz p.pik at volny.cz
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