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}
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}
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\arguments{
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\arguments{
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  \item{x}{an \R object.}
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  \item{x}{an \R object.}
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}
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}
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\value{
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\value{
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  character string giving the ``class'' of \code{x}.
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  character string giving the \dQuote{class} of \code{x}.
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  The ``class'' is the (first element) of the \code{\link[base]{class}}
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  The \dQuote{class} is the (first element) of the
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  attribute if this is non-\code{NULL}, or inferred from the object's
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  \code{\link[base]{class}} attribute if this is non-\code{NULL}, or
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  inferred from the object's \code{dim} attribute if this is
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  \code{dim} attribute if this is non-\code{NULL}, or \code{mode(x)}.
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  non-\code{NULL}, or \code{mode(x)}.
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  Simply speaking, \code{data.class(x)} returns what is typically useful
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  Simply speaking, \code{data.class(x)} returns what is typically useful
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  for method dispatching.  (Or, what the basic creator functions already
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  for method dispatching.  (Or, what the basic creator functions already
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  and maybe eventually all will attach as a class attribute.)
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  and maybe eventually all will attach as a class attribute.)
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}
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}