<NA> from cut.Date
On 17/09/2014 12:04, Benjamin Tyner wrote:
Hello, I'm wondering if this is expected?
It is as documented!
> cut(structure(11111, class="Date"), structure(c(11100,11111),
class="Date"))
[1] <NA>
Levels: 2000-05-23
The help page says that "for ?"Date"? objects, only ?"day"?, ?"week"?,
?"month"?, ?"quarter"? and ?"year"? are allowed" [for the 'breaks'
argument]. Though I am not sure whether this statement is only
applicable in the context of the previous sentence about interval
specification (i.e., a roundabout way of saying that ?"sec"?, ?"min"?,
?"hour"?, and ?"DSTday"? are not allowed for 'Date' objects), or whether
it also means that a vector of cut points (as in my example) is likewise
not allowed? If the latter, then perhaps the function out to error out
rather than return <NA> in this case?
The NA is correct: the value you pass is not covered by the 'breaks' you
specified. As the help says
Using both ?right = TRUE? and ?include.lowest = TRUE? will include
both ends of the range of dates.
With the default values, only the lower end is included.
Brian D. Ripley, ripley at stats.ox.ac.uk Emeritus Professor of Applied Statistics, University of Oxford 1 South Parks Road, Oxford OX1 3TG, UK