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