* lib/matrix.rb: Generalize Vector#cross_product to arbitrary dimensions

  based on a patch by gogo tanaka [#10074]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48183 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 2 deletions

diff --git a/test/matrix/test_vector.rb b/test/matrix/test_vector.rb
index 4e2bca6ef6..a063d2ca12 100644
--- a/test/matrix/test_vector.rb
+++ b/test/matrix/test_vector.rb
@@ -169,7 +169,17 @@ class TestVector < Test::Unit::TestCase
   def test_cross_product
     v = Vector[1, 0, 0].cross_product Vector[0, 1, 0]
     assert_equal(Vector[0, 0, 1], v)
-    v = Vector[1, 0, 0].cross Vector[0, 1, 0]
-    assert_equal(Vector[0, 0, 1], v)
+    v2 = Vector[1, 2].cross_product
+    assert_equal(Vector[-2, 1], v2)
+    v3 = Vector[3, 5, 2, 1].cross(Vector[4, 3, 1, 8], Vector[2, 9, 4, 3])
+    assert_equal(Vector[16, -65, 139, -1], v3)
+    assert_equal Vector[0, 0, 0, 1],
+      Vector[1, 0, 0, 0].cross(Vector[0, 1, 0, 0], Vector[0, 0, 1, 0])
+    assert_equal Vector[0, 0, 0, 0, 1],
+      Vector[1, 0, 0, 0, 0].cross(Vector[0, 1, 0, 0, 0], Vector[0, 0, 1, 0, 0], Vector[0, 0, 0, 1, 0])
+    assert_raise(Vector::ErrDimensionMismatch) { Vector[1, 2, 3].cross_product(Vector[1, 4]) }
+    assert_raise(TypeError) { Vector[1, 2, 3].cross_product(42) }
+    assert_raise(ArgumentError) { Vector[1, 2].cross_product(Vector[2, -1]) }
+    assert_raise(Vector::ErrOperationNotDefined) { Vector[1].cross_product }
   end
 end