# [R] Inconsistency of 1^NA=1 vs. 1.1^NA=NA

Da Zheng zhengda1936 at gmail.com
Thu Nov 17 21:47:58 CET 2016

```I tried on my computer.
> (1+ 0i)^ NA
[1] NaN+NaNi

On Thu, Nov 17, 2016 at 3:42 PM, Bert Gunter <bgunter.4567 at gmail.com> wrote:

> On Nov 17, 2016 11:55 AM, "Thierry Onkelinx" <thierry.onkelinx at inbo.be>
> wrote:
> >
> > Dear Da,
> >
> > NA represents an unknown value x. 1 ^ x = 1 for all possible values of x.
> > Hence 1 ^ NA = 1.
> >
> That is false. For any n, n-1 of the nth roots of 1 differ from 1(they are
> complex). I don't have my computer with me. What does (1+ 0i)^ NA give?
>
> Bert
>
> > Best regards,
> >
> > ir. Thierry Onkelinx
> > Instituut voor natuur- en bosonderzoek / Research Institute for Nature
> and
> > Forest
> > team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
> > Kliniekstraat 25
> > 1070 Anderlecht
> > Belgium
> >
> > To call in the statistician after the experiment is done may be no more
> > than asking him to perform a post-mortem examination: he may be able to
> say
> > what the experiment died of. ~ Sir Ronald Aylmer Fisher
> > The plural of anecdote is not data. ~ Roger Brinner
> > The combination of some data and an aching desire for an answer does not
> > ensure that a reasonable answer can be extracted from a given body of
> data.
> > ~ John Tukey
> >
> > 2016-11-17 20:19 GMT+01:00 Da Zheng <zhengda1936 at gmail.com>:
> >
> > > Hello,
> > >
> > > I just realized that 1^NA outputs 1 while 1.1^NA outputs NA in R
> v3.3.1 and
> > > R v3.2.3.
> > > I tried other values such as 0^NA and 2^NA, and they all output NA.
> > > I don't understand this inconsistency here. Shouldn't 1^NA output NA as
> > > well? Why does R handle it differently? Or is this a bug in these
> > > particular versions of R?
> > >
> > > Thanks,
> > > Da
> > >
> > >         [[alternative HTML version deleted]]
> > >
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> >
> >         [[alternative HTML version deleted]]
> >
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