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}
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}
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\value{
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\value{
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  The value returned by the selected method.
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  The value returned by the selected method.
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}
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}
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\references{
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\references{
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  The R package \pkg{methods} implements, with a few exceptions, the
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  programming interface for classes
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 Chambers, John M. (2008)
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  and methods in the book \emph{Programming with Data} (John
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 \emph{Software for Data Analysis: Programming with R}
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  M. Chambers, Springer, 1998), in particular sections 1.6, 2.7, 2.8,
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  and chapters 7 and 8.
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  Springer.  (For the R version.)
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  While the programming interface for the \pkg{methods} package follows
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  the reference, the R software is an original implementation, so
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  details in the reference that reflect the S4 implementation may appear
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  differently in R.  Also, there are extensions to the programming
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  interface developed more recently than the reference.  For a
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 Chambers, John M. (1998)
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  discussion of details see \code{?\link{Methods}}
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 \emph{Programming with Data}
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  and the links from that documentation.
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 Springer (For the original S4 version.)
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}
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}
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\seealso{\code{\link{callGeneric}} to call the generic function with the current
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\seealso{\link{Methods} for the general behavior of method dispatch}
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  dispatch rules (typically for a group generic function); \link{Methods} for the general behavior of method dispatch}
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\examples{
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\examples{
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## some class definitions with simple inheritance
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## some class definitions with simple inheritance
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setClass("B0" , representation(b0 = "numeric"))
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setClass("B0" , representation(b0 = "numeric"))