Thanks Brian! The confusion was due to my failure to notice that these two functions have opposite defaults for 'right':
> args(cut.default) function (x, breaks, labels = NULL, include.lowest = FALSE, right = TRUE, dig.lab = 3L, ordered_result = FALSE, ...) > args(cut.Date) function (x, breaks, labels = NULL, start.on.monday = TRUE, right = FALSE, ...) I suppose the latter does make sense, given that days, months, years etc are right-continuous functions of time. Regards Ben > 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 > <https://stat.ethz.ch/mailman/listinfo/r-help> > Emeritus Professor of Applied Statistics, University of Oxford > 1 South Parks Road, Oxford OX1 3TG, UK
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.