marcandre	2015-03-06 08:45:42 +0900 (Fri, 06 Mar 2015)

  New Revision: 49866

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=49866

  Log:
    * lib/matrix.rb: Add Vector#round. Patch by Jordan Stephens.
      [Fixes GH-802]

  Modified files:
    trunk/ChangeLog
    trunk/NEWS
    trunk/lib/matrix.rb
    trunk/test/matrix/test_matrix.rb
    trunk/test/matrix/test_vector.rb
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 49865)
+++ ChangeLog	(revision 49866)
@@ -1,3 +1,8 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Fri Mar  6 08:45:26 2015  Marc-Andre Lafortune  <ruby-core@m...>
+
+	* lib/matrix.rb: Add Vector#round. Patch by Jordan Stephens.
+	  [Fixes GH-802]
+
 Fri Mar  6 07:33:03 2015  Koichi Sasada  <ko1@a...>
 
 	* gc.c (obj_info): show node name too.
Index: lib/matrix.rb
===================================================================
--- lib/matrix.rb	(revision 49865)
+++ lib/matrix.rb	(revision 49866)
@@ -1713,6 +1713,7 @@ end https://github.com/ruby/ruby/blob/trunk/lib/matrix.rb#L1713
 # * #norm
 # * #normalize
 # * #r
+# * #round
 # * #size
 #
 # Conversion to other data types:
@@ -1790,6 +1791,13 @@ class Vector https://github.com/ruby/ruby/blob/trunk/lib/matrix.rb#L1791
   alias set_component []=
   private :[]=, :set_element, :set_component
 
+  # Returns a vector with entries rounded to the given precision
+  # (see Float#round)
+  #
+  def round(ndigits=0)
+    map{|e| e.round(ndigits)}
+  end
+
   #
   # Returns the number of elements in the vector.
   #
Index: NEWS
===================================================================
--- NEWS	(revision 49865)
+++ NEWS	(revision 49866)
@@ -44,6 +44,9 @@ with all sufficient information, see the https://github.com/ruby/ruby/blob/trunk/NEWS#L44
  * Base64.urlsafe_decode64: now it accepts not only correctly-padded
    input but also unpadded input.
 
+* lib/matrix.rb
+ * Add Vector#round. https://github.com/ruby/ruby/pull/802
+
 * ext/coverage/coverage.c
   * Coverage.peek_result: new method to allow coverage to be captured without
     stopping the coverage tool.
Index: test/matrix/test_vector.rb
===================================================================
--- test/matrix/test_vector.rb	(revision 49865)
+++ test/matrix/test_vector.rb	(revision 49866)
@@ -157,6 +157,10 @@ class TestVector < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/matrix/test_vector.rb#L157
     assert_equal(5, Vector[3, 4].r)
   end
 
+  def test_round
+    assert_equal(Vector[1.234, 2.345, 3.40].round(2), Vector[1.23, 2.35, 3.4])
+  end
+
   def test_covector
     assert_equal(Matrix[[1,2,3]], @v1.covector)
   end
Index: test/matrix/test_matrix.rb
===================================================================
--- test/matrix/test_matrix.rb	(revision 49865)
+++ test/matrix/test_matrix.rb	(revision 49866)
@@ -190,6 +190,12 @@ class TestMatrix < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/matrix/test_matrix.rb#L190
     assert_equal(@m1, Matrix[o, [4,5,6]])
   end
 
+  def test_round
+    a = Matrix[[1.0111, 2.32320, 3.04343], [4.81, 5.0, 6.997]]
+    b = Matrix[[1.01, 2.32, 3.04], [4.81, 5.0, 7.0]]
+    assert_equal(a.round(2), b)
+  end
+
   def test_rows
     assert_equal(@m1, Matrix.rows([[1, 2, 3], [4, 5, 6]]))
   end

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