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

From: Renaud Gaujoux <>
Date: Fri, 09 Jul 2010 14:49:39 +0200

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
### UNIVERSITY OF CAPE TOWN This e-mail is subject to the UCT ICT policies and e-mail disclaimer published on our website at or obtainable from +27 21 650 4500. This e-mail is intended only for the person(s) to whom it is addressed. If the e-mail has reached you in error, please notify the author. If you are not the intended recipient of the e-mail you may not use, disclose, copy, redirect or print the content. If this e-mail is not related to the business of UCT it is sent by the sender in the sender's individual capacity. ### ______________________________________________ mailing list
Received on Fri 09 Jul 2010 - 12:57:15 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Fri 09 Jul 2010 - 13:20:16 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.

list of date sections of archive