On 4/27/05, Ali - <[EMAIL PROTECTED]> wrote: > > > > > > > > > > Here is an example. Note that $ does not evaluate y so you have > > > >to do it yourself: > > > > > > > >x <- structure(3, class = "myclass") > > > >y <- 5 > > > >foo <- function(x,y) x+y > > > >"$.myclass" <- function(x, i) { i <- eval.parent(parse(text=i)); > foo(x, > > > i) > > > >} > > > >x$y # structure(8, class = "myclass") > > > > > If I got it right, in the above example you provided '$' is defined as a > method for a S3 class. How is it possible to do the same with a S4 class. > If > this is not possible, what is the best way to define the '$' operator > whose > first arguments is a S4 object and doesn't overwrite the global > definition? > > The myclass example is defined as an S3 method. In the above its defined > as a function, not a method.
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