The use of <NA> to indicate "missing" when printing in a
non-quoted
context seems like a good idea to me. But it appears to have a
side-effect:
> foo <-
data.frame(x=1:5,ch=c('a','b',NA,'c','d'),gr=rep('ab',5))
> foo
x ch gr
1 1 a ab
2 2 b ab
3 3 <NA> ab
4 4 c ab
5 5 d ab> version
_
platform sparc-sun-solaris2.7
arch sparc
os solaris2.7
system sparc, solaris2.7
status
major 1
minor 5.0
year 2002
month 04
day 29
language R
> print.data.frame(foo,quote=T)
x ch gr
1 "1" "a" "ab"
2 "2" "b" "ab"
3 "3" NA "ab"
4 "4" "c" "ab"
5 "5" "d" "ab"
> print.data.frame(foo,right=T)
x ch gr
1 1 a ab
2 2 b ab
3 3 <NA> ab
4 4 c ab
5 5 d ab
> print.data.frame(foo,right=F)
x ch gr
1 1 a ab
2 2 b ab
3 3 <NA> ab
4 4 c ab
5 5 d ab
--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA
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