Math.tanh is wrong
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Key: JRUBY-1591
URL: http://jira.codehaus.org/browse/JRUBY-1591
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.x
Environment: Ubuntu Linux 7.10,
ruby 1.8.5 (2007-11-20 rev 4842) [i386-jruby1.1b1]
Reporter: Vladimir Sizikov
In MRI: Math.tanh(1.0/0.0) => 1.0
In JRuby: Math.tanh 1.0/0.0 => NaN
This problem is detected by Rubinius spec tests:
Math.tanh returns the hyperbolic tangent of the argument FAILED
Expected NaN to equal 1.0:
/opt/work/rubinius/spec/mini_rspec.rb:217:in `=='
/opt/work/rubinius/./spec/core/math/tanh_spec.rb:12:in `=='
/opt/work/rubinius/./spec/core/math/tanh_spec.rb:9:in `it'
/opt/work/rubinius/spec/mini_rspec.rb:403:in `it'
/opt/work/rubinius/./spec/core/math/tanh_spec.rb:9:in `it'
/opt/work/rubinius/./spec/core/math/tanh_spec.rb:9:in `describe'
/opt/work/rubinius/spec/mini_rspec.rb:399:in `describe'
/opt/work/rubinius/./spec/core/math/tanh_spec.rb:4:in `describe'
/opt/work/rubinius/./spec/core/math/tanh_spec.rb:4:in `load'
last_mspec.rb:11:in `load'
last_mspec.rb:1:in `each'
last_mspec.rb:6:in `each
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