From davison at uchicago.edu  Tue Nov  1 22:47:39 2005
From: davison at uchicago.edu (davison@uchicago.edu)
Date: Tue,  1 Nov 2005 22:47:39 +0100 (CET)
Subject: [Rd] Im() of negative non-complex numbers is pi (PR#8272)
Message-ID: <20051101214739.C8E3623D24@slim.kubism.ku.dk>


Sorry, I meant to write 2.1.1 instead of 2.2.1 below.


On Tue, 1 Nov 2005 davison at uchicago.edu wrote:

> 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
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>



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