From jmc@research.bell-labs.com  Mon Dec 11 14:20:47 2000
From: jmc@research.bell-labs.com (John Chambers)
Date: Mon, 11 Dec 2000 09:20:47 -0500 (EST)
Subject: [Rd] "S4"-style methods and classes in R
Message-ID: <200012111420.JAA00341@jessie.research.bell-labs.com>

A preliminary version of an R package for classes and methods is
available from the omegahat web site:

	  http://www.omegahat.org/RSMethods/index.html

Documentation and source for download are available from this page.

The goal is to support an API that would provide compatible facilities
for defining classes and methods in R and S-Plus.  For the moment, the
"API" is roughly taken from "Programming with Data", particularly
section 1.6.

A revised version of that section is available, from the web page
above, modified a bit for R use.

This is a preliminary version;  comments and suggestions on any aspect
would be much appreciated, before going more "public" with it.

The current version is all written in the S language, for
flexibility.  Key portions (method dispatch at the least) will be
implemented in C later on for efficiency.

Regards,
 John Chambers

-- 
John M. Chambers                  jmc@bell-labs.com
Bell Labs, Lucent Technologies    office: (908)582-2681
700 Mountain Avenue, Room 2C-282  fax:    (908)582-3340
Murray Hill, NJ  07974            web: http://www.cs.bell-labs.com/~jmc
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[Rd] "S4"-style methods and classes in R
John Chambers