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  \code{nrow} and \code{ncol} return the number of rows or columns
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  \code{nrow} and \code{ncol} return the number of rows or columns
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  present in \code{x}.
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  present in \code{x}.
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  \code{NCOL} and \code{NROW} do the same treating a vector as
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  \code{NCOL} and \code{NROW} do the same treating a vector as
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  1-column matrix.
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  1-column matrix.
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}
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}
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\references{
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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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  Wadsworth \& Brooks/Cole (\code{ncol} and \code{nrow}.)
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}
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\seealso{
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\seealso{
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  \code{\link{dim}} which returns \emph{all} dimensions;
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  \code{\link{dim}} which returns \emph{all} dimensions;
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  \code{\link{array}}, \code{\link{matrix}}.
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  \code{\link{array}}, \code{\link{matrix}}.
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}
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}
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\value{an \code{\link{integer}} of length 1 or \code{\link{NULL}}.}
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\value{an \code{\link{integer}} of length 1 or \code{\link{NULL}}.}