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  S3 and S4 methods.  S3 methods are printed by pasting the generic
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  S3 and S4 methods.  S3 methods are printed by pasting the generic
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  function and class together, separated by a \sQuote{.}, as
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  function and class together, separated by a \sQuote{.}, as
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  \code{generic.class}.  The S3 method name is followed by an asterisk
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  \code{generic.class}.  The S3 method name is followed by an asterisk
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  \code{*} if the method definition is not exported from the package
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  \code{*} if the method definition is not exported from the package
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  namespace in which the method is defined.  S4 method signatures are
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  namespace in which the method is defined.  S4 method signatures are
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  printed as \code{generic,class-method}; S4 allows for multiple
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  printed as \samp{generic,class-method}; S4 allows for multiple
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  dispatch, so there may be several classes in the signature
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  dispatch, so there may be several classes in the signature
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  \code{generic,A,B-method}.
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  \samp{generic,A,B-method}.
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  When invoked with the \code{class} argument, \code{"byclass"} is
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  When invoked with the \code{class} argument, \code{"byclass"} is
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  \code{TRUE}, and the \code{print} method by default displays the names
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  \code{TRUE}, and the \code{print} method by default displays the names
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  of the generic functions associated with the class, \code{generic}.
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  of the generic functions associated with the class, \code{generic}.
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