Dear list,
I suppose that the behaviour of cut.Date() is not as intended for the
case ' breaks="year" ' (in R 2.4.1 and previous versions):
The corresponding code fragment which defines the first breakpoint in
this case reads:
if (valid == 4) {
start$mon <- 0
incr <- 366
}
So the month of the first breakpoint is set to January, but the day of
month is not set to 1.
This leads to a strange behaviour, see the following example:
>
cut(as.Date(c("2000-01-17","2001-01-13","2001-01-20")),breaks="y")
[1] 2000-01-17 2000-01-17 2001-01-17
Levels: 2000-01-17 2001-01-17
I think, the code fragment above should better read:
if (valid == 4) {
start$mon <- 0
start$mday <- 1
incr <- 366
}
(Of course, maybe there are reasons for the current behaviour which I am
not aware of, and the current behaviour is as intended.)
Regards,
Martin