On 02/07/2010 08:31 PM, Markus Weisner wrote: > I created some S4 objects that are essentially data frame objects. The S4 > object definitions were necessary to verify data integrity and force a > standardized data format. I am, however, finding myself redefining all the > typical generic functions so that I can still manipulate my S4 objects as if > they were data frames ... I have used setMethod to set methods for "subset", > "head", and "tail". I would like to use setMethod or setGeneric to enable > me to use object$slotname to access obj...@slotname for my S4 objects. Any > advice is appreciated. Thanks.
Hi Markus -- > setClass("A", representation(a="numeric")) [1] "A" > new("A")$a Error in new("A")$a : $ operator not defined for this S4 class > getGeneric("$") standardGeneric for "$" defined from package "base" function (x, name) standardGeneric("$", .Primitive("$")) <environment: 0xa62028> Methods may be defined for arguments: x Use showMethods("$") for currently available ones. > setMethod("$", "A", function(x, name) slot(x, name)) [1] "$" > new("A", a=1:10)$a [1] 1 2 3 4 5 6 7 8 9 10 > new("A", a=1:10)$b Error in slot(x, name) : no slot of name "b" for this object of class "A" does that help? Martin > --Markus > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Martin Morgan Computational Biology / Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 Location: Arnold Building M1 B861 Phone: (206) 667-2793 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.