On 06/18/2012 01:49 PM, spf385 wrote:
Greetings,
I'm still very new to R; however I have been tasked with converting an S4
object into a data.frame. We are just trying to learn the basics of S4.
Could anyone offer a 'simple' example of coercing an S4 object (such as
might be stored in a package attribute) into a data.frame? Ultimately, we
would like to do something along the lines of
mydata<- as.data.frame(original S4 object)
see ?setAs for more extensive discussion.
Not sure what 'stored in a package attribute might mean'. Here's a class
setClass("A", representation(x="numeric", y="numeric"))
and how to coerce from "A" to a "data.frame"
setAs("A", "data.frame", function(from) data.frame(x=from@x, y=from@y))
and then in action
> a = new("A", x=1:5, y=5:1)
> as(a, "data.frame")
x y
1 1 5
2 2 4
3 3 3
4 4 2
5 5 1
To use as.data.frame(a), you'd have to implement the 'as.data.frame.A'
S3 method, e.g.,
as.data.frame.A = function(x) as(x, "data.frame")
Also, probably you'd want a validity method (see ?setValidity) on "A",
to ensure that x, y were equal length.
Martin
Thanks in advance!
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