Re: [R] setMethodReplace.. Help!

[John Chambers]

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([EMAIL PROTECTED],[EMAIL PROTECTED])
          }
          )
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)
                 {
                  [EMAIL PROTECTED](value,"numeric") 
                 }
                 )

Please Help.
Eryk.
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--
John M. Chambers                  [EMAIL PROTECTED]
Bell Labs, Lucent Technologies    office: (908)582-2681
700 Mountain Avenue, Room 2C-282  fax:    (908)582-3340
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