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  length zero, \code{NA} of an appropriate type is used for atomic
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  length zero, \code{NA} of an appropriate type is used for atomic
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  vectors (\code{0} for raw vectors) and \code{NULL} for lists.
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  vectors (\code{0} for raw vectors) and \code{NULL} for lists.
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  Unlike \code{\link{matrix}}, \code{array} does not currently remove
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  Unlike \code{\link{matrix}}, \code{array} does not currently remove
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  any attributes left by \code{as.vector} from a classed list
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  any attributes left by \code{as.vector} from a classed list
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  \code{data}, so can returned a list array with a class attribute.
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  \code{data}, so can return a list array with a class attribute.
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  \code{as.array} is a generic function for coercing to arrays.  The
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  \code{as.array} is a generic function for coercing to arrays.  The
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  default method does so by attaching a \code{\link{dim}} attribute to
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  default method does so by attaching a \code{\link{dim}} attribute to
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  it.  It also attaches \code{\link{dimnames}} if \code{x} has
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  it.  It also attaches \code{\link{dimnames}} if \code{x} has
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  \code{\link{names}}.  The sole purpose of this is to make it possible
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  \code{\link{names}}.  The sole purpose of this is to make it possible