Hi
I'm trying to implement S4 methods in a package, and I am having
difficulty defining "+" to do what I want.
In the Green Book, there is a discussion of a "track" object,
setClass("track", representation(x="numeric", y="numeric"))
OK.
track1 <- new("track",x=c(1,4,6),y=c(10,11,12))
track2 <- new("track",x=c(2,5),y=c(100,101))
What I want to do is to define "+" for track object so that if
track3 <- track1 + track2
has [EMAIL PROTECTED] == c(1,2,4,5,6)
and
[EMAIL PROTECTED] = c(10,100,11,101,12)
maybe adding a track object to a scalar would shift the values of the
x slot.
The algorithm itself is no problem...but what is the S4 equivalent to
the S3 technique of writing an Ops.track() function that tells
R what "+" means?
--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
tel 023-8059-7743
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