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  positive length) or not.  It is generic: you can write methods to handle
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  positive length) or not.  It is generic: you can write methods to handle
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  specific classes of objects, see \link{InternalMethods}.
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  specific classes of objects, see \link{InternalMethods}.
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}
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}
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\note{
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\note{
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  \code{is.array} is a \link{primitive} function.
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  \code{is.array} is a \link{primitive} function.
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  Versions of \R prior to 2.16.0 allowed (although documented not to) a
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  zero-length \code{dim} argument, and returned a vector of length one.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth & Brooks/Cole.
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  Wadsworth & Brooks/Cole.