On 13-07-03 7:54 PM, Erin Hodgess wrote:
Dear R People:
I am experimenting with S4 classes and methods but am having trouble with
setting up a class.
Here is an example:
buzz <- setClass("buzz",slots=c(x="matrix"),
+ validity <- function(object) {
+ if(is.matrix(object)==FALSE)stop("Input must be a matrix")
+ TRUE
+ })
Error in setClass("buzz", slots = c(x = "matrix"), validity <-
function(object) { :
Argument "representation" cannot be used if argument "slots" is supplied
I know that there is something simple that I'm just not seeing.
Since you used <-, your third argument uses the positional name
"representation", not "validity", which is presumably what you intended.
Duncan Murdoch
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