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  where \code{name} specifies an existing function, possibly in another
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  where \code{name} specifies an existing function, possibly in another
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  package.  An alternative when creating a new generic function in this package is:
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  package.  An alternative when creating a new generic function in this package is:
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  \code{setGeneric(name, def)}
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  \code{setGeneric(name, def)}
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  where the function definition  \code{def} specifies the formal
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  where the function definition \code{def} specifies the formal
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  arguments and becomes the default method.
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  arguments and becomes the default method.
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}
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}
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\usage{
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\usage{
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setGeneric(name, def= , group=list(), valueClass=character(),
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setGeneric(name, def= , group=list(), valueClass=character(),
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  }
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  }
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  \item{group}{ The name of the group
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  \item{group}{ The name of the group
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    generic function to which this function belongs.  See
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    generic function to which this function belongs.  See
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    \link{Methods_Details} for details of group generic functions in method
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    \link{Methods_Details} for details of group generic functions in method
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    selection and \link{S4GroupGenerics} for existing groups.
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    selection and \link{S4groupGeneric} for existing groups.
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  }
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  }
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  \item{valueClass}{ A character vector specifying one or more class
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  \item{valueClass}{ A character vector specifying one or more class
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    names.  The value returned by the generic function must
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    names.  The value returned by the generic function must
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    have (or extend) this class, or one of the classes; otherwise,
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    have (or extend) this class, or one of the classes; otherwise,
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    an error is generated.
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    an error is generated.