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\seealso{\code{nchar} for counting the number of characters in character
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\seealso{\code{nchar} for counting the number of characters in character
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  vectors, \code{\link{lengths}} for getting the length of every element
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  vectors, \code{\link{lengths}} for getting the length of every element
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  in a list.
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  in a list.
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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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  \bibshow{R:Becker+Chambers+Wilks:1988}
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  \emph{The New S Language}.
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  Wadsworth & Brooks/Cole.
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}
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}
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\examples{
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\examples{
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length(diag(4))  # = 16 (4 x 4)
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length(diag(4))  # = 16 (4 x 4)
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length(options())  # 12 or more
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length(options())  # 12 or more
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length(y ~ x1 + x2 + x3)  # 3
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length(y ~ x1 + x2 + x3)  # 3