* lib/cmath.rb (log10): raised exception when the given number is

a negative real.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@23658 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Tue Jun  9 22:38:09 2009  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* lib/cmath.rb (log10): raised exception when the given number is
+	  a negative real.
+
 Tue Jun  9 15:13:14 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* dir.c (dir_s_glob): fixed rdoc.  a patch from Joseph Pecoraro a

lib/cmath.rb

@@ -47,7 +47,7 @@ module CMath
   end
 
   def log10(z)
-    if z.real?
+    if z.real? and z >= 0
       log10!(z)
     else
       log(z) / log!(10)