On Tue, 2006-10-17 at 09:23 +0200, Edward d Auvergne wrote:
Update of bug #6874 (project relax):
Status: None => Wont Fix
Assigned to: None => bugman
Open/Closed: Open => Closed
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Follow-up Comment #2:
I've chased this problem down to the MS Windows 2.4.3 version of Python. In
this version, attempting the operation NaN**2 fails with a ValueError. In
the Python 2.4.1 in Linux, NaN**2 = NaN! I'm not sure if this is the Python
version number or the Windows Python version which is problematic. As this
bug should never be encountered by a user (it only occurs when the global
correlation time and internal correlation time are both zero) and will
probably be fixed in future Windows Python versions, I am closing the bug
report. I am not going to attempt a fix for the problem because the problem
lies in the Windows Python executables.
As Python's floating-point behaviour is generaly inherited from the
underlying C machinery, this is almost certainly a 'feature' of whatever
C compiler was used to build the windows Python version. Don't hold your
breath for a fix - the powers that be in the Python world are in no
hurry to change this (because building a fast, robust and platform
independent fp machinery is a truly massive task, and they have better
things to do with their time). I can't see MS being in any rush to
change their compiler's behaviour either.
I agree though, that this is not a big issue in the current context. If
it appears in a more serious context, we will have to catch the
situation before the ValueError is thrown in order to at least give the
user a meaningful error message.
Chris
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Re: [bug #6874] math domain error (in MS Windows).