> complex(real = 0, imaginary = Inf) [1] 0+Infi > Inf*1i [1] NaN+Infi
>> complex(real = 0, imaginary = Inf)/5 [1] NaN+Infi See the Note in ?complex for the explanation, I think. Duncan can correct if I'm wrong. -- Bert On Thu, Sep 5, 2024 at 3:20 PM Leo Mada <leo.m...@syonic.eu> wrote: > Dear Bert, > > These behave like real divisions/multiplications: > complex(re=Inf, im = Inf) * 5 > # Inf+Infi > complex(re=-Inf, im = Inf) * 5 > # -Inf+Infi > > The real division / multiplication should be faster and also is well > behaved. I was expecting R to do the real division/multiplication on a > complex number. Which R actually does for these very particular cases; but > not when only Im(x) is Inf. > > Sincerely, > > Leonard > > ------------------------------ > *From:* Bert Gunter <bgunter.4...@gmail.com> > *Sent:* Friday, September 6, 2024 1:12 AM > *To:* Duncan Murdoch <murdoch.dun...@gmail.com> > *Cc:* Leo Mada <leo.m...@syonic.eu>; r-help@r-project.org < > r-help@r-project.org> > *Subject:* Re: [R] BUG: atan(1i) / 5 = NaN+Infi ? > > Perhaps > > > Inf*1i > [1] NaN+Infi > > clarifies why it is *not* a bug. > (Boy, did that jog some long dusty math memories :-) ) > > -- Bert > > On Thu, Sep 5, 2024 at 2:48 PM Duncan Murdoch <murdoch.dun...@gmail.com> > wrote: > > On 2024-09-05 4:23 p.m., Leo Mada via R-help wrote: > > Dear R Users, > > > > Is this desired behaviour? > > I presume it's a bug. > > > > atan(1i) > > # 0+Infi > > > > tan(atan(1i)) > > # 0+1i > > > > atan(1i) / 5 > > # NaN+Infi > > There's no need to involve atan() and tan() in this: > > > (0+Inf*1i)/5 > [1] NaN+Infi > > Why do you think this is a bug? > > Duncan Murdoch > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > https://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide https://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
