Re: [Rd] Defining a method that behaves like '$'?

From: Renaud Gaujoux <renaud_at_mancala.cbio.uct.ac.za>
Date: Fri, 09 Jul 2010 14:49:39 +0200

Alright.
Maybe the symbol I chose was not appropriate. I tried ':' to be able to do 'a:name' with 'a' a S4 object.
I get the following error:
Error in genericForPrimitive(f) :

   methods may not be defined for primitive function ":" in this version of R

Does there exist any symbol that would be suitable for the job? Thanks

-- 
Renaud Gaujoux
Computational Biology - University of Cape Town
South Africa


On 09/07/2010 14:29, Duncan Murdoch wrote:

> On 09/07/2010 8:18 AM, Renaud Gaujoux wrote:
>> Hi,
>>
>> is there a way to define a method say '$$' that would behave like '$'
>> and allow calls like 'a$$name'?
> No, the parser handles a fixed syntax, and that expression is not
> legal. You could do it with
>
> a %$$% name
>
> using the infix operator syntax. (I think the description in the R
> Language Definition suggests this is not legal, since $$ is not a
> valid name, but it does currently work and that's unlikely to change.)
>
> Duncan Murdoch
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