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, ...)
an object inheriting from class
a vector of cut points or number giving the number of
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
arguments to be passed to or from other methods.
Note that the default for
right differs from the
default method. Using
TRUE will include both ends of the range of dates.
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:
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
## 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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