On 28/05/2009 8:17 PM, Stavros Macrakis wrote:
I couldn't get your suggested method to work:
`==.foo` <- function(a,b) unclass(a)==unclass(b)
`>.foo` <- function(a,b) unclass(a) < unclass(b) # invert comparison
is.na.foo <- function(a)is.na(unclass(a))
sort(structure(sample(5),class="foo")) #-> 1:5 -- not reversed
What am I missing?
I'm not sure: I've never actually used that, I was basing it on the
docs. Looks like it's not as simple as I thought. Sorry for the
misinformation.
Duncan Murdoch
-s
On Thu, May 28, 2009 at 5:48 PM, Duncan Murdoch <murd...@stats.uwo.ca>wrote:
On 28/05/2009 5:34 PM, Steve Jaffe wrote:
Sounds simple but haven't been able to find it in docs: is it possible to
sort a vector using a user-defined comparison function? Seems it must be,
but "sort" doesn't seem to provide that option, nor does "order" sfaics
You put a class on the vector (e.g. using class(x) <- "myvector"), then
define a conversion to numeric (e.g. xtfrm.myvector) or actual comparison
methods (you'll need ==.myvector, >.myvector, and is.na.myvector).
Duncan Murdoch
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