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      \code{"prod"}, \code{"sum"}, \code{"any"}, \code{"all"}}
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      \code{"prod"}, \code{"sum"}, \code{"any"}, \code{"all"}}
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    \item{\code{Complex}}{\code{"Arg"}, \code{"Conj"}, \code{"Im"},
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    \item{\code{Complex}}{\code{"Arg"}, \code{"Conj"}, \code{"Im"},
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      \code{"Mod"}, \code{"Re"}}
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      \code{"Mod"}, \code{"Re"}}
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  }
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  }
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  Note that \code{Ops} merely consists of three sub groups.
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  Note that \code{Ops} merely consists of three sub groups.
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  All the functions in these groups (other than the group generics
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  All the functions in these groups (other than the group generics
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  themselves) are basic functions in \R.  They are not by default S4 generic
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  themselves) are basic functions in \R.  They are not by default S4 generic
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  functions, and many of them are defined as primitives.  However, you can still define
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  functions, and many of them are defined as primitives.  However, you can still define
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  formal methods for them, both individually and via the group generics.  It all works more or less as you
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  formal methods for them, both individually and via the group generics.  It all works more or less as you
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  might expect, admittedly via a bit of trickery in the background.
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  might expect, admittedly via a bit of trickery in the background.
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  you must set a specific method for these functions in order to call
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  you must set a specific method for these functions in order to call
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  them with the extra argument(s).
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  them with the extra argument(s).
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  For further details about group generic functions see section 10.5 of
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  For further details about group generic functions see section 10.5 of
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  \emph{Software for Data Analysis}.
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  \emph{Software for Data Analysis}.
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}
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}
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\references{
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\references{
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 Chambers, John M. (2008)
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 Chambers, John M. (2008)
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 \emph{Software for Data Analysis: Programming with R}
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 \emph{Software for Data Analysis: Programming with R}
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  Springer.  (For the R version.)
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  Springer.  (For the R version.)