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  The first form below returns the object's attribute list.
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  The first form below returns the object's attribute list.
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  The replacement forms uses the list on the right-hand
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  The replacement forms uses the list on the right-hand
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  side of the assignment as the object's attributes (if appropriate).
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  side of the assignment as the object's attributes (if appropriate).
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}
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}
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\usage{
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\usage{
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attributes(obj)
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attributes(x)
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attributes(obj) <- value
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attributes(x) <- value
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mostattributes(obj) <- value
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mostattributes(x) <- value
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}
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}
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\arguments{
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\arguments{
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  \item{obj}{an object}
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  \item{x}{any \R object}
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  \item{value}{an appropriate named list of attributes, or \code{NULL}.}
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  \item{value}{an appropriate named \code{\link{list}} of attributes, or
- 
 
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    \code{NULL}.}
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}
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}
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\details{
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\details{
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  Unlike \code{\link{attr}} it is possible to set attributes on a
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  Unlike \code{\link{attr}} it is not an error to set attributes on a
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  \code{NULL} object: it will first be coerced to an empty list.
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  \code{NULL} object: it will first be coerced to an empty list.
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  Note that some attributes (namely \code{\link{class}},
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  Note that some attributes (namely \code{\link{class}},
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  \code{\link{comment}}, \code{\link{dim}}, \code{\link{dimnames}},
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  \code{\link{comment}}, \code{\link{dim}}, \code{\link{dimnames}},
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  \code{\link{names}}, \code{\link{row.names}} and
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  \code{\link{names}}, \code{\link{row.names}} and