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* lib/cmath.rb (CMath.cbrt): returns the principal value of the cube
root of the argument. fix #3676 * test/test_cmath.rb (test_cbrt_returns_principal_value_of_cube_root): test for the above change. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32047 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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3 changed files with 14 additions and 6 deletions
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@ -1,3 +1,11 @@
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Mon Jun 13 14:35:00 2011 Kenta Murata <mrkn@mrkn.jp>
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* lib/cmath.rb (CMath.cbrt): returns the principal value of the cube
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root of the argument. fix #3676
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* test/test_cmath.rb (test_cbrt_returns_principal_value_of_cube_root):
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test for the above change.
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Mon Jun 13 14:17:00 2011 Kenta Murata <mrkn@mrkn.jp>
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* lib/test/unit.rb (Test::Unit::GlobOption#non_options): fix typo.
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@ -122,13 +122,9 @@ module CMath
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end
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##
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# returns the cube root of +z+
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# returns the principal value of the cube root of +z+
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def cbrt(z)
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if z.real?
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cbrt!(z)
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else
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Complex(z) ** (1.0/3)
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end
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Complex(z) ** (1.0/3)
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end
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##
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@ -5,4 +5,8 @@ class TestCMath < Test::Unit::TestCase
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def test_sqrt
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assert_equal CMath.sqrt(1.0.i), CMath.sqrt(1.i), '[ruby-core:31672]'
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end
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def test_cbrt_returns_principal_value_of_cube_root
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assert_equal CMath.cbrt(-8), (-8)**(1.0/3), '#3676'
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end
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end
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