On Nov 2, 2010, at 11:53 AM, Simone Gabbriellini wrote:
Hello List,
this should be simple, but cannot figure it out. I am trying to
subset a data.frame like this:
data4
users time
1 user5 2009-12-01 14:09:58
2 user1 2009-12-01 14:40:16
3 user8 2009-12-04 08:18:37
4 user6 2009-12-04 08:18:37
5 user83 2009-12-04 08:18:37
6 user82 2009-12-04 08:18:37
7 user31 2009-12-04 08:18:37
8 user85 2009-12-04 08:18:37
9 user33 2009-12-04 08:18:37
10 user2 2010-01-05 07:18:36
I would like to subset it and retain, let's say, only the data with
time < '2010-01-05 07:18:36', but I have no idea about the sintax to
do that.
is something like this close to the correct way:
active<-data4['time'<= as.POSIXct("2010-01-05 07:18:36",
origin="1970-01-01 00:00:00-00")]
Close. Try:
active <- data4[data4$time <= as.POSIXct("2010-01-05 07:18:36",
origin="1970-01-01 00:00:00-00") , ]
Or:
active <- subset(data4, time <= as.POSIXct("2010-01-05 07:18:36",
origin="1970-01-01 00:00:00-00") )
--
David Winsemius, MD
West Hartford, CT
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