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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
* 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
This commit is contained in:
mrkn 2011-06-13 05:36:59 +00:00
parent da923d2b1f
commit e6bea8978c
3 changed files with 14 additions and 6 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
Mon Jun 13 14:35:00 2011 Kenta Murata <mrkn@mrkn.jp>
* 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.
Mon Jun 13 14:17:00 2011 Kenta Murata <mrkn@mrkn.jp> Mon Jun 13 14:17:00 2011 Kenta Murata <mrkn@mrkn.jp>
* lib/test/unit.rb (Test::Unit::GlobOption#non_options): fix typo. * lib/test/unit.rb (Test::Unit::GlobOption#non_options): fix typo.

8
lib/cmath.rb
View file

@ -122,13 +122,9 @@ module CMath
end end
## ##
# returns the cube root of +z+ # returns the principal value of the cube root of +z+
def cbrt(z) def cbrt(z)
if z.real? Complex(z) ** (1.0/3)
cbrt!(z)
else
Complex(z) ** (1.0/3)
end
end end
## ##

4
test/test_cmath.rb
View file

@ -5,4 +5,8 @@ class TestCMath < Test::Unit::TestCase
def test_sqrt def test_sqrt
assert_equal CMath.sqrt(1.0.i), CMath.sqrt(1.i), '[ruby-core:31672]' assert_equal CMath.sqrt(1.0.i), CMath.sqrt(1.i), '[ruby-core:31672]'
end end
def test_cbrt_returns_principal_value_of_cube_root
assert_equal CMath.cbrt(-8), (-8)**(1.0/3), '#3676'
end
end end