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\details{
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\details{
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  If either of \code{nrow} or \code{ncol} is not given, an attempt is
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  If either of \code{nrow} or \code{ncol} is not given, an attempt is
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  made to infer it from the length of \code{data} and the other
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  made to infer it from the length of \code{data} and the other
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  parameter.
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  parameter.
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  If there are too few elements in \code{data} to fill the array,
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  then the elements in \code{data} are recycled.  If \code{data} has
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  length zero, \code{NA} of an appropriate type is used for atomic
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  vectors and \code{NULL} for lists.
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  \code{is.matrix} returns \code{TRUE} if \code{x} is a matrix (i.e., it
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  \code{is.matrix} returns \code{TRUE} if \code{x} is a matrix (i.e., it
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  is \emph{not} a \code{\link{data.frame}} and has a \code{\link{dim}}
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  is \emph{not} a \code{\link{data.frame}} and has a \code{\link{dim}}
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  attribute of length 2) and \code{FALSE} otherwise.
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  attribute of length 2) and \code{FALSE} otherwise.
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  \code{as.matrix} is a generic function. The method for data frames
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  \code{as.matrix} is a generic function. The method for data frames