From c1a0a09d2b7fb920640857d4ed4b48761b94fb86 Mon Sep 17 00:00:00 2001
From: marcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 20 Nov 2017 02:18:43 +0000
Subject: 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
---
 lib/matrix.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'lib')

diff --git a/lib/matrix.rb b/lib/matrix.rb
index 2f2d0f371a..d242665ef9 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -979,6 +979,17 @@ class Matrix
     end
   end
 
+  #
+  # Hadamard product
+  #    Matrix[[1,2], [3,4]].hadamard_product(Matrix[[1,2], [3,2]])
+  #      => 1  4
+  #         9  8
+  #
+  def hadamard_product(m)
+    combine(m){|a, b| a * b}
+  end
+  alias_method :entrywise_product, :hadamard_product
+
   #
   # Returns the inverse of the matrix.
   #   Matrix[[-1, -1], [0, -1]].inverse
-- 
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