[Rd] Re: [R] Several R vs S-Plus issues

[Duncan Murdoch]

On Thu, 4 Oct 2001 18:14:48 +0200, Kurt Hornik wrote in message
<15292.35576.513722.492732@mithrandir.hornik.net>:

>Agreed.  As Peter said, subscripting by NA should give NA but R cannot
>distinguish a string NA from the string NA. 

But it does make some sort of distinction, as my example contrasting
"NA" with paste(NA) shows.  In case you missed it:

 > is.na("NA")
 [1] TRUE
 > paste(NA)
 [1] "NA"
 > is.na(paste(NA))
 [1] FALSE

Duncan Murdoch


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