On 9/22/2006 4:02 PM, Sender wrote:
> Hello R-help:
>
> I was hoping someone could help me understand a particular function i came
> across in a package:
>
> "$.myClass" <- function( x, name ) {
> sym = paste( "foo", name, sep = "_" )
> if( is.loaded(sym) )
> .Call(sym,x)
> }
>
> I understand the paste, and .Call part, but I'm not sure how this function
> would get called? What exactly is $. ? is it a regular expression? Would a
> user call this method directly, or is it an internal function that gets
> called according to a class/type.
It's the implementation of the "$" function for myClass objects, so if x
was a myClass object, it would be called when something like
x$name
was used in an expression. It would call an external function named
foo_name, passing x as an argument.
Duncan Murdoch
>
> something similar to:
>
> plot.lm()
>
> Thanks in advance !
>
> Greg
>
> [[alternative HTML version deleted]]
>
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