marcandre	2010-04-30 03:18:58 +0900 (Fri, 30 Apr 2010)

  New Revision: 27553

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=27553

  Log:
    * lib/matrix.rb (Matrix#singular?, Matrix#regular?): raise on rectangular
      matrices, and use determinant instead of rank.

  Modified files:
    trunk/lib/matrix.rb

Index: lib/matrix.rb
===================================================================
--- lib/matrix.rb	(revision 27552)
+++ lib/matrix.rb	(revision 27553)
@@ -478,17 +478,17 @@
   end
 
   #
-  # Returns +true+ if this is a regular matrix.
+  # Returns +true+ if this is a regular (i.e. non-singular) matrix.
   #
   def regular?
-    square? and rank == column_size
+    not singular?
   end
 
   #
-  # Returns +true+ is this is a singular (i.e. non-regular) matrix.
+  # Returns +true+ is this is a singular matrix.
   #
   def singular?
-    not regular?
+    determinant == 0
   end
 
   #

--
ML: ruby-changes@q...
Info: http://www.atdot.net/~ko1/quickml/