setMethodReplace.. Help!
The error message says it: in R, the arguments for the generic function
"[" include i and j; the method definition must include those as well.
Do getGeneric("[") or ?"[" to see the arguments.
As has been said on the R mailing lists in the past, R is generally
compatible with the published books, but not when there is a better
approach. Having the extra arguments allows methods to be based on the
class of the row or column indices.
wolski wrote:
Hi!
Trying to reproduce some examples from "Programming with Data" page 341.
Can not reproduce it neither on R1.8.1. nor R1.9.0devel?
library(methods)
setClass("track",representation(x="numeric",y="numeric"))
setMethod("["
,"track"
,function(x,...,drop=T){
track(x at x[...],y at y[...])
}
)
In method for function "[": Expanding the signature to
include omitted arguments in definition: i = "missing",
j = "missing"
Error in .MakeSignature(new("signature"), def, signature) :
The names in signature for method (x, , ) don't match function's arguments (x, i, j, drop)
The same....
setReplaceMethod("[","track"
,function(x,...,value)
{
x at y[...]=as(value,"numeric")
}
)
Please Help.
Eryk.
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