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    simple call with one argument.
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    simple call with one argument.
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    Do supply \code{def} if there is no
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    Do supply \code{def} if there is no
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    current function of this name or for some reason you do not want
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    current function of this name or for some reason you do not want
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    to use that function to define the generic. In that case, the
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    to use that function to define the generic. In that case, the
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    formal arguments and
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    formal arguments and
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    default values for the generic are taken from \code{def}.  In most
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    default values for the generic are taken from \code{def}.  In most
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    cases, the body of \code{def} will then define the default method,
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    cases, the body of \code{def} will then define the default method,
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    as the existing function did in the one-argument call.
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    as the existing function did in the one-argument call.
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    If you want to create a new generic function with \emph{no}
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    If you want to create a new generic function with \emph{no}
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    default method, then \code{def} should be only a call to
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    default method, then \code{def} should be only a call to
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    \code{\link{standardGeneric}} with the same character string as
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    \code{\link{standardGeneric}} with the same character string as
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    \code{name}.
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    \code{name}.
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  }
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  }
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  \item{group}{ Optionally, a character string giving the name of the group
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  \item{group}{ Optionally, a character string giving 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} for details of group generic functions in method selection.
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    \link{Methods} for details of group generic functions in method selection.
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  }
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  }