On Thu, 25 Dec 2014, Mike Miller wrote:
I was going to ask a question about it how to test that an object is a
vector, but then I found this:
"is.vector() does not test if an object is a vector. Instead it returns
TRUE only if the object is a vector with no attributes apart from names.
Use is.atomic(x) || is.list(x) to test if an object is actually a
vector."
From here:
http://adv-r.had.co.nz/Data-structures.html#vectors
But here...
https://stat.ethz.ch/R-manual/R-devel/library/base/html/vector.html
...I read, "Note that factors are *not* vectors" (emphasis theirs), yet...
d <- gl(2,2)
is.factor(d)
[1] TRUE
is.atomic(d) || is.list(d)
[1] TRUE
is.list(d)
[1] FALSE
is.atomic(d)
[1] TRUE
is.vector(d)
[1] FALSE
So the factor is not a vector according to R documentation, but it is a
vector according to the Wickham test, and it is not a vector according to
is.vector(). Admittedly, the latter seems not to mean much to the R
experts. Maybe a factor is just a vector with additional attributes.
Mike
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