2006/4/4, [EMAIL PROTECTED] <[EMAIL PROTECTED]>:
>
> Full_Name: c fillekes
> Version: Version 2.2.1 (2005-12-20 r36812)
> OS: Gentoo Linux kernel 2.6.12
> Submission from: (NULL) (129.116.71.233)
>
>
>
>
> "Not Available" is of course not a numeric:
> R
>
> > is.numeric (NA)
> [1] FALSE
In the help you can read:
"
'NA' is a logical constant of length 1 which contains a missing
value indicator. 'NA' can be freely coerced to any other vector
type except raw.
"
And in fact:
> storage.mode(NA)
[1] "logical"
> storage.mode(NA+0)
[1] "double"
> storage.mode(as.numeric(NA))
[1] "double"
> storage.mode(as.character(NA))
[1] "character"
So in
NA+NA
the logical is automatically coerced to a numerical value, and
is.numericreturns TRUE, as expected.
But for some reason, all arithmetic operations on NA's are
> in fact numeric, even if it's with other NA's.
>
>
> > is.numeric (NA+NA)
> [1] TRUE
> > is.numeric (NA^2)
> [1] TRUE
> > is.numeric (NA-NA)
> [1] TRUE
> > is.numeric (NA*NA)
> [1] TRUE
> > is.numeric (NA/NA)
> [1] TRUE
> >
>
> This is not the expected thing.
I think this is the expected thing.
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>
Antonio, Fabio Di Narzo.
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