tadf	2011-07-30 23:53:14 +0900 (Sat, 30 Jul 2011)

  New Revision: 32761

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=32761

  Log:
    * lib/cmath.rb (cbrt): should return a real number if possible.

  Modified files:
    branches/ruby_1_9_3/ChangeLog
    branches/ruby_1_9_3/lib/cmath.rb

Index: ruby_1_9_3/ChangeLog
===================================================================
--- ruby_1_9_3/ChangeLog	(revision 32760)
+++ ruby_1_9_3/ChangeLog	(revision 32761)
@@ -1,3 +1,7 @@
+Sat Jul 30 23:51:44 2011  Tadayoshi Funaba  <tadf@d...>
+
+	* lib/cmath.rb (cbrt): should return a real number if possible.
+
 Sat Jul 30 23:48:04 2011  Tadayoshi Funaba  <tadf@d...>
 
 	* ext/date/date_core.c: an issue that is same as  [ruby-dev:44071].
Index: ruby_1_9_3/lib/cmath.rb
===================================================================
--- ruby_1_9_3/lib/cmath.rb	(revision 32760)
+++ ruby_1_9_3/lib/cmath.rb	(revision 32761)
@@ -147,7 +147,7 @@
   ##
   # returns the principal value of the cube root of +z+
   def cbrt(z)
-    Complex(z) ** (1.0/3)
+    z ** (1.0/3)
   end
 
   ##

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