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* bpo-44339: Fix math.pow corner case to comply with IEEE 754 (GH-26606)Mark Dickinson2021-06-121-4/+2
| | | Change the behaviour of `math.pow(0.0, -math.inf)` and `math.pow(-0.0, -math.inf)` to return positive infinity instead of raising `ValueError`. This makes `math.pow` consistent with the built-in `pow` (and the `**` operator) for this particular special case, and brings the `math.pow` special-case handling into compliance with IEEE 754.
* Merged revisions 77139-77140 via svnmerge fromMark Dickinson2009-12-301-2/+4
| | | | | | | | | | | | | | | svn+ssh://pythondev@svn.python.org/python/trunk ........ r77139 | mark.dickinson | 2009-12-30 12:12:23 +0000 (Wed, 30 Dec 2009) | 3 lines Issue #7534: Fix handling of nans, infinities, and negative zero in ** operator, on IEEE 754 platforms. Thanks Marcos Donolo for original patch. ........ r77140 | mark.dickinson | 2009-12-30 12:22:49 +0000 (Wed, 30 Dec 2009) | 1 line Add Marcos Donolo for work on issue 7534 patch. ........
* Quick fix for test_math failures on Solaris 10 buildbot. For futureMark Dickinson2008-06-181-8/+8
| | | | | reference, note that that asin(float('inf')) doesn't seem to return the expected NaN on this platform.
* Make floating-point exception error messages slightly more verbose: inMark Dickinson2008-04-301-8/+8
| | | | | | | | particular, the error message now allows one to distinguish between a ValueError arising from a singularity (e.g. log(0.)), which would usually produce +-infinity in non-stop mode, and a ValueError resulting from an invalid input (e.g. sqrt(-1.)), which would normally produce a NaN in non-stop mode.
* Merged revisions 62380,62382-62383 via svnmerge fromChristian Heimes2008-04-191-0/+183
svn+ssh://pythondev@svn.python.org/python/trunk ........ r62380 | christian.heimes | 2008-04-19 01:13:07 +0200 (Sat, 19 Apr 2008) | 3 lines I finally got the time to update and merge Mark's and my trunk-math branch. The patch is collaborated work of Mark Dickinson and me. It was mostly done a few months ago. The patch fixes a lot of loose ends and edge cases related to operations with NaN, INF, very small values and complex math. The patch also adds acosh, asinh, atanh, log1p and copysign to all platforms. Finally it fixes differences between platforms like different results or exceptions for edge cases. Have fun :) ........ r62382 | christian.heimes | 2008-04-19 01:40:40 +0200 (Sat, 19 Apr 2008) | 2 lines Added new files to Windows project files More Windows related fixes are coming soon ........ r62383 | christian.heimes | 2008-04-19 01:49:11 +0200 (Sat, 19 Apr 2008) | 1 line Stupid me. Py_RETURN_NAN should actually return something ... ........
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