| cut.POSIXt | R Documentation |
Method for cut applied to date-time objects.
## S3 method for class 'POSIXt'
cut(x, breaks, labels = NULL, start.on.monday = TRUE,
right = FALSE, ...)
## S3 method for class 'Date'
cut(x, breaks, labels = NULL, start.on.monday = TRUE,
right = FALSE, ...)
x |
an object inheriting from class |
breaks |
a vector of cut points or number giving the number of
intervals which |
labels |
labels for the levels of the resulting category. By default,
labels are constructed from the left-hand end of the intervals
(which are included for the default value of |
start.on.monday |
logical. If |
right, ... |
arguments to be passed to or from other methods. |
Note that the default for right differs from the
default method. Using include.lowest =
TRUE will include both ends of the range of dates.
Using breaks = "quarter" will create intervals of 3 calendar
months, with the intervals beginning on January 1, April 1,
July 1 or October 1 (based upon min(x)) as appropriate.
A vector of breaks will be sorted before use: labels should
correspond to the sorted vector.
A factor is returned, unless labels = FALSE which returns
the integer level codes.
Values which fall outside the range of breaks are coded as
NA, as are and NA values.
seq.POSIXt, seq.Date, cut
## random dates in a 10-week period
cut(ISOdate(2001, 1, 1) + 70*86400*stats::runif(100), "weeks")
cut(as.Date("2001/1/1") + 70*stats::runif(100), "weeks")
# The standards all have midnight as the start of the day, but some
# people incorrectly interpret it at the end of the previous day ...
tm <- seq(as.POSIXct("2012-06-01 06:00"), by = "6 hours", length.out = 24)
aggregate(1:24, list(day = cut(tm, "days")), mean)
# and a version with midnight included in the previous day:
aggregate(1:24, list(day = cut(tm, "days", right = TRUE)), mean)
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