From: Antonio, Fabio Di Narzo <antonio.fabio_at_gmail.com>

Date: Tue 04 Apr 2006 - 19:52:37 GMT

"

And in fact:

> R-devel@r-project.org mailing list

*> https://stat.ethz.ch/mailman/listinfo/r-devel
*

*>
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R-devel@r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-devel Received on Wed Apr 05 06:17:21 2006

Date: Tue 04 Apr 2006 - 19:52:37 GMT

2006/4/4, cfillekes@gmail.com <cfillekes@gmail.com>:

*>
*

> 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.

> R-devel@r-project.org mailing list

Antonio, Fabio Di Narzo.

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R-devel@r-project.org mailing list

https://stat.ethz.ch/mailman/listinfo/r-devel Received on Wed Apr 05 06:17:21 2006

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