This is a bug in the mingw runtime, and not in R. So the difference is between OSes, not between R versions. Note that
> acosh(2) [1] 1.316958 > acosh(2+0i) [1] 0+NaNi > acosh(2+1e-10i) [1] 1.316958+0i so it seems to be happening only for exactly real complex numbers. I think there are also problems with branch cuts. On Thu, 30 Nov 2006, [EMAIL PROTECTED] wrote: > Full_Name: Tom Short > Version: 2.4.0 > OS: Windows XP > Submission from: (NULL) (68.236.159.227) > > > It looks like there's a bug in acosh with complex number in windows: > >> acosh(2) > [1] 1.316958 >> acosh(2+0i) > [1] 0+NaNi > > This happens for me on Windows XP with the following versions: > R version 2.2.0, 2005-10-06, i386-pc-mingw32 > R version 2.4.0 (2006-10-03) i386-pc-mingw32 > > It works fine with the following: > R version 2.4.0 (2006-10-03) i386-pc-linux-gnu (debian) > R version 2.1.0, 2005-04-18, i386-pc-linux-gnu (debian) > >> acosh(2+0i) > [1] 1.316958+0i > > I didn't find any problem with asinh or atanh taking complex numbers. In > src/main/complex.c, there are some #ifdef Win32's in z_asin and z_acos, so it > may be related to that. acosh is unrelated to those. > - Tom > > Tom Short > EPRI Solutions, Inc. > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
