bug in acosh (win32) (PR#9403)
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, tshort at eprisolutions.com 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.
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