Re: [R] R (external ?) reference

2003-02-28 Thread Luke Tierney 
On Fri, 28 Feb 2003, Laurent Gautier wrote:

 Dear List,
 
 I found a documentation on the web that mentions things like 'R references'
 (http://www.stat.uiowa.edu/~luke/R/simpleref.html).
 
 However, I could not find the R_MakeReference and friends in R...
 Does anyone knows more about that ?
 

It's not as clear as it could be in that document but that part was
just a proposal.  It has not been implemented.  Something at the pure
R level along these lines can easily be implemented with environments;
something a bit more sophisticated may eventually make it into the
methods package.

luke

-- 
Luke Tierney
University of Iowa  Phone: 319-335-3386
Department of Statistics andFax:   319-335-3017
   Actuarial Science
241 Schaeffer Hall  email:  [EMAIL PROTECTED]
Iowa City, IA 52242 WWW:  http://www.stat.uiowa.edu

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RE: [R] R (external ?) reference

2003-02-28 Thread Henrik Bengtsson 
 -Original Message-
 From: [EMAIL PROTECTED] 
 [mailto:[EMAIL PROTECTED] On Behalf Of Luke Tierney
 Sent: den 1 mars 2003 01:31
 To: Laurent Gautier
 Cc: [EMAIL PROTECTED]
 Subject: Re: [R] R (external ?) reference
 
 
 On Fri, 28 Feb 2003, Laurent Gautier wrote:
 
  Dear List,
  
  I found a documentation on the web that mentions things like 'R 
  references' (http://www.stat.uiowa.edu/~luke/R/simpleref.html).
  
  However, I could not find the R_MakeReference and friends 
 in R... Does 
  anyone knows more about that ?
  
 
 It's not as clear as it could be in that document but that 
 part was just a proposal.  It has not been implemented.  
 Something at the pure R level along these lines can easily be 
 implemented with environments; something a bit more 
 sophisticated may eventually make it into the methods package.

For details on how environments can be used to implement/emulate
references using plain R code (as Luke suggest) see Implementing
support for references in [R]
(http://www.maths.lth.se/help/R/ImplementingReferences/). See especially
section 4.1 Using an environment directly and 4.2 Encapsulating an
enviroment in a list or in an attribute, which points out the important
fact that you should wrap up your environment variable in a list to be
able to assign a (S3) class to it.

Cheers

Henrik Bengtsson
Lund University, Sweden
 
 luke
 
 -- 
 Luke Tierney
 University of Iowa  Phone: 319-335-3386
 Department of Statistics andFax:   319-335-3017
Actuarial Science
 241 Schaeffer Hall  email:  [EMAIL PROTECTED]
 Iowa City, IA 52242 WWW:  http://www.stat.uiowa.edu

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[EMAIL PROTECTED] mailing list
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