merges r24949 from trunk into ruby_1_9_1.

--
* lib/matrix.rb (determinant): Bug fix where determinant failed on some matrices [ruby-core:23597]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@25622 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/matrix.rb b/lib/matrix.rb
index c948836fa..6fbaacb4b 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -683,7 +683,7 @@ class Matrix
       if (akk = a[k][k]) == 0
         i = k
         loop do
-          return 0 if (ii += 1) > size
+          return 0 if (i += 1) > size
           break unless a[i][k] == 0
         end
         a[i], a[k] = a[k], a[i]