[1.9] Math.gamma(-1.0/0), Math.gamma(1.0/0) and Math.gamma(0.0/0) return
incorrect results
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Key: JRUBY-4430
URL: http://jira.codehaus.org/browse/JRUBY-4430
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules, Ruby 1.9
Affects Versions: JRuby 1.4
Environment: github trunk, Java 6, Mac OS X 10.6.2
Reporter: Hiro Asari
Fix For: JRuby 1.5
Attachments:
0001-Align-Math.gamma-behavior-with-that-of-MRI-on-Infini.patch
Note on MRI trunk:
{noformat}
surfboard:~$ ruby1.9 -v -e 'p Math.gamma(-1.0/0)'ruby 1.9.2dev (2010-01-04
trunk 26238) [x86_64-darwin10.2.0]
-e:1:in `gamma': Numerical argument out of domain - gamma (Errno::EDOM)
from -e:1:in `<main>'
surfboard:~$ ruby1.9 -v -e 'p Math.gamma(1.0/0); p Math.gamma(0.0/0)'
ruby 1.9.2dev (2010-01-04 trunk 26238) [x86_64-darwin10.2.0]
Infinity
NaN
{noformat}
Specs I added in RubySpec commit 0314628 will trip JRuby.
I attached the patch to fix this issue.
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