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\details{
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\details{
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  The functions \code{dim} and \code{dim<-} are generic.
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  The functions \code{dim} and \code{dim<-} are generic.
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  \code{dim} has a method for \code{\link{data.frame}}s, which returns
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  \code{dim} has a method for \code{\link{data.frame}}s, which returns
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  the length of the \code{row.names} attribute of \code{x} and the
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  the length of the \code{row.names} attribute of \code{x} and the
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  length of \code{x} (the numbers of ``rows'' and ``columns'').
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  length of \code{x} (the numbers of \dQuote{rows} and \dQuote{columns}).
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}
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}
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\value{
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\value{
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  For an array (and hence in particular, for a matrix) \code{dim} retrieves
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  For an array (and hence in particular, for a matrix) \code{dim} retrieves
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  the \code{dim} attribute of the object.  It is \code{NULL} or a vector
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  the \code{dim} attribute of the object.  It is \code{NULL} or a vector
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  of mode \code{\link{integer}}.
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  of mode \code{\link{integer}}.