* lib/matrix (column): handle negative arguments. cf [ruby-core:23598]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@25451 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/matrix.rb b/lib/matrix.rb
index d14fdef4f..a8d9b98ff 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -309,13 +309,13 @@ class Matrix
   #
   def column(j) # :yield: e
     if block_given?
-      return self if j >= column_size
+      return self if j >= column_size || j < -column_size
       row_size.times do |i|
         yield @rows[i][j]
       end
       self
     else
-      return nil if j >= column_size
+      return nil if j >= column_size || j < -column_size
       col = (0 ... row_size).collect {|i|
         @rows[i][j]
       }