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2010 Sep 23
1
Behavior of R CMD build and library() w.r.t. setGeneric-like functions
...ke setGeneric/setMethod in S4.
As a simple example, I write code like this:
guard(month.date, isa(Date,date))
ensure(month.date, as.numeric(result) < 13)
month.date <- function(date) format(date, '%m')
guard(month.int, is.numeric(date))
month.int <- function(date) month(i2date(date))
and call it like this:
> month(20100913)
[1] "09"
Behind the scenes, the guard command is using 'assign' to create a
parent function with the name 'month'. This can be done explicitly as
well, although it is typically not necessary. The parent definition
lo...