marcandre	2011-06-29 10:13:22 +0900 (Wed, 29 Jun 2011)

  New Revision: 32280

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=32280

  Log:
    * lib/matrix.rb: Matrix.zero can build rectangular matrices.
      Vector#r should be called #magnitude

  Modified files:
    trunk/ChangeLog
    trunk/NEWS
    trunk/lib/matrix.rb

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 32279)
+++ ChangeLog	(revision 32280)
@@ -1,3 +1,8 @@
+Wed Jun 29 10:13:12 2011  Marc-Andre Lafortune  <ruby-core@m...>
+
+	* lib/matrix.rb: Matrix.zero can build rectangular matrices.
+	  Vector#r should be called #magnitude
+
 Wed Jun 29 10:11:08 2011  Marc-Andre Lafortune  <ruby-core@m...>
 
 	* lib/matrix.rb: Add Matrix#diagonal?, hermitian?, normal?,
Index: lib/matrix.rb
===================================================================
--- lib/matrix.rb	(revision 32279)
+++ lib/matrix.rb	(revision 32280)
@@ -229,13 +229,14 @@
   end
 
   #
-  # Creates an +n+ by +n+ zero matrix.
+  # Creates a zero matrix.
   #   Matrix.zero(2)
   #     => 0 0
   #        0 0
   #
-  def Matrix.zero(n)
-    Matrix.scalar(n, 0)
+  def Matrix.zero(row_size, column_size = row_size)
+    rows = Array.new(row_size){Array.new(column_size, 0)}
+    new rows, column_size
   end
 
   #
@@ -1723,9 +1724,10 @@
   # Returns the modulus (Pythagorean distance) of the vector.
   #   Vector[5,8,2].r => 9.643650761
   #
-  def r
+  def magnitude
     Math.sqrt(@elements.inject(0) {|v, e| v + e*e})
   end
+  alias r magnitude
 
   #--
   # CONVERTING
Index: NEWS
===================================================================
--- NEWS	(revision 32279)
+++ NEWS	(revision 32280)
@@ -168,10 +168,12 @@
     * Matrix#unitary?
     * Matrix#upper_triangular?
     * Matrix#zero?
+    * Vector#magnitude
   * extended methods:
     * Matrix#each and #each_with_index can iterate on a subset of the elements
     * Matrix#find_index returns [row, column] and can iterate on a subset
       of the elements
+    * Matrix.zero can build rectangular matrices
 
 * net/http
   * SNI (Server Name Indication) supported for HTTPS. 

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