matrix.rb: complex vector

* lib/matrix.rb (Vector#magnitude): accumulate squares of absolute
  values to fix for complex vector.  [ruby-dev:46100] [Bug #6966]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36887 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 15 insertions, 0 deletions

diff --git a/test/matrix/test_vector.rb b/test/matrix/test_vector.rb
index 582509fd20..18660df574 100644
--- a/test/matrix/test_vector.rb
+++ b/test/matrix/test_vector.rb
@@ -131,4 +131,19 @@ class TestVector < Test::Unit::TestCase
     assert_equal("Vector[1, 2, 3]", @v1.inspect)
   end
 
+  def test_magnitude
+    assert_in_epsilon(3.7416573867739413, @v1.norm)
+    assert_in_epsilon(3.7416573867739413, @v4.norm)
+  end
+
+  def test_complex_magnitude
+    bug6966 = '[ruby-dev:46100]'
+    v = Vector[Complex(0,1), 0]
+    assert_equal(1.0, v.norm, bug6966)
+  end
+
+  def test_rational_magnitude
+    v = Vector[Rational(1,2), 0]
+    assert_equal(0.5, v.norm)
+  end
 end