davison@uchicago.edu
2005-Nov-01 21:12 UTC
[Rd] Im() of negative non-complex numbers is pi (PR#8272)
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
davison@uchicago.edu
2005-Nov-01 21:47 UTC
[Rd] Im() of negative non-complex numbers is pi (PR#8272)
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 >
ripley@stats.ox.ac.uk
2005-Nov-01 22:08 UTC
[Rd] 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