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% File src/library/base/man/UseMethod.Rd
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% File src/library/base/man/UseMethod.Rd
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% Part of the R package, http://www.R-project.org
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2007 R Core Development Team
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% Copyright 1995-2010 R Core Development Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{UseMethod}
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\name{UseMethod}
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\title{Class Methods}
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\title{Class Methods}
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\alias{UseMethod}
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\alias{UseMethod}
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  exists, or an error results.
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  exists, or an error results.
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  Function \code{\link{methods}} can be used to find out about the
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  Function \code{\link{methods}} can be used to find out about the
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  methods for a particular generic function or class.
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  methods for a particular generic function or class.
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  \code{UseMethod} is a primitive function so positional matching is
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  \code{UseMethod} is a primitive function but (as from \R 2.11.0) uses
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  used and names of supplied arguments are ignored.  It is not the only
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  standard argument matching.  It is not the only means of dispatch of
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  means of dispatch of methods, for there are \link{internal generic}
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  methods, for there are \link{internal generic} and \link{group
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  and \link{group generic} functions.  \code{UseMethod} currently
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  generic} functions.  \code{UseMethod} currently dispatches on the
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  dispatches on the implicit class even for arguments that are not
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  implicit class even for arguments that are not objects, but the other
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  objects, but the other means of dispatch do not.
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  means of dispatch do not.
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  \code{NextMethod} invokes the next method (determined by the
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  \code{NextMethod} invokes the next method (determined by the
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  class vector, either of the object supplied to the generic, or of
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  class vector, either of the object supplied to the generic, or of
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  the first argument to the function containing \code{NextMethod} if a
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  the first argument to the function containing \code{NextMethod} if a
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  method was invoked directly).  Normally \code{NextMethod} is used with
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  method was invoked directly).  Normally \code{NextMethod} is used with