Dear Olivier,
You can use is.null().
apropos("null") finds is.null(), and help.search("null") turns up ?NULL,
which documents is.null().
I hope this helps,
John
------------------------------
John Fox, Professor
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
web: socserv.mcmaster.ca/jfox
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> project.org] On Behalf Of Olivier Lefevre
> Sent: April-24-08 5:19 PM
> To: [EMAIL PROTECTED]
> Subject: [R] How to test for NULL?
>
> x == NULL returns logical(0) instead of FALSE or TRUE as you might
> expect
> and I cannot find the right way to write this test in R.
>
> Thanks in advance for any hint,
>
> -- O.L.
>
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