Dear all
I'm a bit surprised by the results output from nzchar(). The help page
says: "nzchar is a fast way to find out if elements of a character
vector are *non-empty strings*." (my emphasis. However, if you do
> x <- c(letters, NA, '')
> nzchar(x)
[1] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
[13] TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
[25] TRUE TRUE TRUE FALSE
> any(is.na(x))
[1] TRUE
the NA value in the character vector will be considered as a non-empty
string, something that I find strange. At best NA is the equivalent of
an empty string. In this sense, if you Hmisc::describe() the vector
you get, as I would expect, that in the context of character vectors
NA and '' values are considered together:
> require(Hmisc)
> describe(x)
x
n missing unique
26 2 26
lowest : a b c d e, highest: v w x y z
So is this a bug in the function or in the help page? Regards
Liviu
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