[R] Use of contains in S4 classes

From: Ross Boylan <ross_at_biostat.ucsf.edu>
Date: Fri 19 Aug 2005 - 07:14:31 EST


setClass("B", representation=representation("B", extra="numeric)) setClass("B", representation=representation(extra="numeric"),

        contains="B")
Are these the same? If not, how do they differ?

What about
setClass("B", representation=representation("B", extra="numeric"),

        contains="B")
?

As far as I can tell, the Green Book doesn't talk about a contains argument to setClass.

-- 
Ross Boylan                                      wk:  (415) 502-4031
530 Parnassus Avenue (Library) rm 115-4          ross@biostat.ucsf.edu
Dept of Epidemiology and Biostatistics           fax: (415) 476-9856
University of California, San Francisco
San Francisco, CA 94143-0840                     hm:  (415) 550-1062

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Received on Fri Aug 19 07:19:37 2005

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