diff --git a/NEWS b/NEWS
index 798c881..112fb0e 100644
--- a/NEWS
+++ b/NEWS
@@ -61,6 +61,10 @@ with all sufficient information, see the ChangeLog file.
       which is obtained by multiplying the first minor by (-1)**(row + column).
     * Matrix#@+ and Matrix#@- .
 
+* Vector
+  * New methods:
+    * Vector#@+ and Vector#@- .
+
 * Method
   * New methods:
     * Method#curry([arity]) returns a curried Proc.
diff --git a/lib/matrix.rb b/lib/matrix.rb
index 6fa1a42..b74e5f2 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1574,6 +1574,7 @@ end
 # * #+(v)
 # * #-(v)
 # * #+@
+# * #-@
 #
 # Vector functions:
 # * #inner_product(v)
@@ -1802,6 +1803,10 @@ class Vector
     self
   end
 
+  def -@
+    collect {|e| -e }
+  end
+
   #--
   # VECTOR FUNCTIONS -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
   #++
diff --git a/test/matrix/test_vector.rb b/test/matrix/test_vector.rb
index fc3aa15..337aaa8 100644
--- a/test/matrix/test_vector.rb
+++ b/test/matrix/test_vector.rb
@@ -115,6 +115,11 @@ class TestVector < Test::Unit::TestCase
     assert_equal(@v1, +@v1)
   end
 
+  def test_negate
+    assert_equal(Vector[-1, -2, -3], -@v1)
+    assert_equal(@v1, -(-@v1))
+  end
+
   def test_inner_product
     assert_equal(1+4+9, @v1.inner_product(@v1))
   end