[R] setMethod for "["

From: Musa Parmaksiz <musa.parmaksiz_at_gmail.com>
Date: Thu, 20 Mar 2008 23:40:38 +0100

Hi R-Help,

Please consider the following simple case: I have a class like


               representation(x="matrix", y="character"))

and I would like to use the method *"["* for a *myClass* objects (but changing the default *drop* argument from TRUE to FALSE):


    x <- x_at_x

suppose that *as.myClass* method has been already defined. Actually, all I want is to pass all the arguments to *"["* method for *matrix*, except changing the default behaviour for *drop*.

When I execute:
> test<-new("myClass",x=cbind(1:3,4:6),y="a")
> test[1,] # works as expected

[1] 1 4

> test[1,drop=TRUE] # does not work

Error: argument "j" is missing, with no default Error in callNextMethod() : error in evaluating a 'primitive' next method

but with a matrix the two cases work:
> m<-cbind(1:3,4:6)
> m[1,]

[1] 1 4
> m[1,drop=TRUE]

[1] 1

Can you please advise me a solution for this problem? Thank you in advance for the help.


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