Im() of negative non-complex numbers is pi (PR#8272)
On Tue, 1 Nov 2005 davison at uchicago.edu wrote:
Sorry, I meant to write 2.1.1 instead of 2.2.1 below.
OK, but it was changed in 2.1.1 patched so one needs to be precise. We used to have Arg=Im for such numbers and Arg was wrong, then Im was wrong (and now both are correct in 2.2.0 patched).
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
______________________________________________ R-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595