Howdy all,
I have a problem that I'd like some advice/help in solving---it has to do
with R's pass-by-value system. I understand the issue, but am wondering if
anyone has found a working solution in dealing with it for cases when one
wants to modify an object inside of a method, specifically when working with
S4. I'm aware that R.oo is able to deal with this using S3, but I'd really
rather stick to S4.
The basics of what I would like to do are coded below:
setClass("MyMatrix",
representation(
parameters="matrix",
uniqueCount="numeric"
),
prototype(
parameters=matrix(numeric(0),0,0),
uniqueCount=1
)
)
setGeneric("createUniqueName", function(object)
standardGeneric("createUniqueName"))
setMethod("createUniqueName", "MyMatrix", function(object){
retval <- paste("unique_", [EMAIL PROTECTED], sep="")
[EMAIL PROTECTED] <- [EMAIL PROTECTED] + 1
return(retval)
})
x <- new("MyMatrix", parameters=matrix(0, 2, 2))
createUniqueName(x) # returns "unique_1"
x # [EMAIL PROTECTED] is still 1
I understand why this is happening, but am wondering how people in the
community have dealt with it, specifically when using S4. Any advice would
be appreciated. Also, I am aware that this is somewhat of a silly example,
but it should allow you to see what I'm trying to accomplish.
Thank you,
Jeff.
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