[1.9] RubyBignum#**, RubyFixnum#** and RubyFloat#** should return a RubyComplex
if self is negative and raised to a fractional power
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Key: JRUBY-4255
URL: http://jira.codehaus.org/browse/JRUBY-4255
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules, Ruby 1.9
Affects Versions: JRuby 1.4, JRuby 1.5
Environment: github trunk, Java 6, Mac OS X 10.6.2
Reporter: Hiro Asari
Fix For: JRuby 1.5
Attachments:
0001-RubyBignum-RubyFixnum-and-RubyFloat-should-return-Ru.patch
Current trunk behavior:
{noformat}
surfboard:~$ jruby --1.9 -v -e 'p (-0x8000_0000_0000_0000-47)**(1/3.0)'
jruby 1.5.0.dev (ruby 1.9.2dev trunk 24787) (2009-11-20 5b30070) (Java
HotSpot(TM) 64-Bit Server VM 1.6.0_15) [x86_64-java]
-e:1 warning: (...) interpreted as grouped expression
-e:1: NaN (FloatDomainError)
surfboard:jruby[git:master]$ bin/jruby --1.9 -v -e 'p (-5)**(1/3.0)' 2>/dev/null
jruby 1.5.0.dev (ruby 1.9.2dev trunk 24787) (2009-11-20 5b30070) (Java
HotSpot(TM) 64-Bit Server VM 1.6.0_15) [x86_64-java]
NaN
surfboard:jruby[git:personal]$ bin/jruby --1.9 -v -e 'p (-1.25)**(1/3.0)'
2>/dev/null
jruby 1.5.0.dev (ruby 1.9.2dev trunk 24787) (2009-11-20 5b30070) (Java
HotSpot(TM) 64-Bit Server VM 1.6.0_15) [x86_64-java]
NaN
{noformat}
MRI behavior:
{noformat}
surfboard:~$ ruby1.9 -v -e 'p (-0x8000_0000_0000_0000-47)**(1/3.0)'
ruby 1.9.2dev (2009-11-17 trunk 25805) [x86_64-darwin10.2.0]
-e:1: warning: (...) interpreted as grouped expression
(1048575.9999999994+1816186.9075973416i)
surfboard:jruby[git:master]$ ruby1.9 -v -e 'p (-5)**(1/3.0)' 2>/dev/null
ruby 1.9.2dev (2009-11-17 trunk 25805) [x86_64-darwin10.2.0]
(0.8549879733383486+1.480882609682364i)
surfboard:jruby[git:personal]$ ruby1.9 -v -e 'p (-1.25)**(1/3.0)' 2>/dev/null
ruby 1.9.2dev (2009-11-17 trunk 25805) [x86_64-darwin10.2.0]
(0.5386086725079711+0.932897586181032i)
{noformat}
While investigating JRUBY-4008, I noticed this bug. JRuby returns NaN where MRI
returns a Complex.
The attached patch fixes this (and similar issues with RubyNumeric and
RubyFloat).
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