[Rd] Testing for vectors

[Hadley Wickham]

Hi all,

Is there are base function that I've missed that tests if an object is
a vector in the dimensionality sense, rather than the data structure
sense? i.e. something that checks is.null(dim(x)) ?

is.vector() is trivially disqualified since it also checks for the
presence of non-names attributes:

x <- factor(c("a", "a", "b"))
is.vector(x)
#> [1] FALSE

is.null(dim(x))
#> [1] TRUE

Hadley

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