lib/matrix: Add hadamard_product/entrywise_product.

Based on a patch by Charley Hutchison. [GH-674]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60860 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 14 insertions, 0 deletions

diff --git a/test/matrix/test_matrix.rb b/test/matrix/test_matrix.rb
index 92a24d1e9f..d40e0c0430 100644
--- a/test/matrix/test_matrix.rb
+++ b/test/matrix/test_matrix.rb
@@ -418,6 +418,20 @@ class TestMatrix < Test::Unit::TestCase
     assert_equal(Matrix[[1,1],[1,1]], Matrix[[2,2],[2,2]] / o)
   end
 
+  def test_hadamard_product
+    assert_equal(Matrix[[1,4], [9,16]], Matrix[[1,2], [3,4]].hadamard_product(Matrix[[1,2], [3,4]]))
+    assert_equal(Matrix[[2, 6, 12], [20, 30, 42]], @m1.hadamard_product(@n1))
+    o = Object.new
+    def o.to_matrix
+      Matrix[[1, 2, 3], [-1, 0, 1]]
+    end
+    assert_equal(Matrix[[1, 4, 9], [-4, 0, 6]], @m1.hadamard_product(o))
+    e = Matrix.empty(3, 0)
+    assert_equal(e, e.hadamard_product(e))
+    e = Matrix.empty(0, 3)
+    assert_equal(e, e.hadamard_product(e))
+  end
+
   def test_exp
     assert_equal(Matrix[[67,96],[48,99]], Matrix[[7,6],[3,9]] ** 2)
     assert_equal(Matrix.I(5), Matrix.I(5) ** -1)