Thanks Peter. Makes sense. But I would like to point out
that it *is* possible to distinguish between ``NA'' meaning
North America and ``NA'' meaning ``missing value'' in *ordinary*
printing of character vectors. E.g.
> x <- c("Europe","Africa","NA",NA,"SA","Antarctica")
> x
[1] "Europe" "
On 11/02/2010 09:45 PM, Rolf Turner wrote:
>
> Example:
>
> xxx <- data.frame(x=1:26,y=letters)
> xxx$x[c(2,4,6,8)] <- NA
> xxx$y[c(1,3,5,7)] <- NA
>
> yyy <- edit(yyy)
>
> The missing values in xxx$y appear as blanks in the spreadsheet window that
> appears, whereas the
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