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-rw-r--r--ChangeLog5
-rw-r--r--lib/cmath.rb2
2 files changed, 6 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index f85e186121..32c68c9416 100644
--- a/ChangeLog
+++ b/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
diff --git a/lib/cmath.rb b/lib/cmath.rb
index 5b261ed6a8..31c5a59c99 100644
--- a/lib/cmath.rb
+++ b/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)