On Fri, Oct 24, 2008 at 11:37 AM, Dr Eberhard W Lisse <[EMAIL PROTECTED]> wrote:
>
> This looks very cool.
>
> But I must still make a plan with regards to country = "NA" (Namibia)
> or continent = "NA" (North America)
>
> But there are the vignettes.
>
> el
>
NA and "NA" are not the same:
> DF <- data.frame(x = c("a", "NA", NA))
> DF
x
1 a
2 NA
3 <NA>
>
> is.na(NA)
[1] TRUE
> is.na("NA")
[1] FALSE
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