* lib/matrix.rb: Add Vector.zero and Vector#zero?

  Patch by Chia-sheng Chen [#13208]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57976 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/matrix/test_vector.rb b/test/matrix/test_vector.rb
index 72082be84c..687706b5e9 100644
--- a/test/matrix/test_vector.rb
+++ b/test/matrix/test_vector.rb
@@ -11,6 +11,13 @@ class TestVector < Test::Unit::TestCase
     @w1 = Vector[2,3,4]
   end
 
+  def test_zero
+    assert_equal Vector[0, 0, 0, 0], Vector.zero(4)
+    assert_equal Vector[], Vector.zero(0)
+    assert_raise(ArgumentError) { Vector.zero(-1) }
+    assert Vector[0, 0, 0, 0].zero?
+  end
+
   def test_basis
     assert_equal(Vector[1, 0, 0], Vector.basis(size: 3, index: 0))
     assert_raise(ArgumentError) { Vector.basis(size: -1, index: 2) }