From davison at uchicago.edu  Tue Nov  1 22:12:30 2005
From: davison at uchicago.edu (davison@uchicago.edu)
Date: Tue,  1 Nov 2005 22:12:30 +0100 (CET)
Subject: [Rd] Im() of negative non-complex numbers is pi (PR#8272)
Message-ID: <20051101211230.F39D323D22@slim.kubism.ku.dk>

Hi,

I think the following indicates a bug in Im().

> Im(-1)
[1] 3.141592653589793115998
> pi
[1] 3.141592653589793115998
> Im(0i-1)
[1] 0
> Im(-0.9876)
[1] 3.141592653589793115998
> Im(-987654321)
[1] 3.141592653589793115998
> Im(1)
[1] 0
> is.complex(-1)
[1] FALSE

This is R 2.2.0; Im(-1) == 0 with R 2.2.1.

Thanks,

Dan

> version
          _
platform i386-pc-linux-gnu
arch     i386
os       linux-gnu
system   i386, linux-gnu
status
major    2
minor    2.0
year     2005
month    10
day      06
svn rev  35749
language R

Debian (stable) linux



[Rd] Im() of negative non-complex numbers is pi (PR#8272)
davison@uchicago.edu