From fac245828b9e354c9eeb93a029f1643031c3c62d Mon Sep 17 00:00:00 2001
From: marcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 1 Apr 2010 18:02:27 +0000
Subject: * lib/matrix.rb: New method #empty? [ruby-core:26284]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27156 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/matrix.rb | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'lib/matrix.rb')

diff --git a/lib/matrix.rb b/lib/matrix.rb
index 25245fd15c..6227c435bf 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -386,6 +386,14 @@ class Matrix
   # TESTING -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
   #++
 
+  #
+  # Returns +true+ if this is an empty matrix, i.e. if the number of rows
+  # or the number of columns is 0.
+  #
+  def empty?
+    column_size == 0 || row_size == 0
+  end
+
   #
   # Returns +true+ if this is a regular matrix.
   #
@@ -910,7 +918,7 @@ class Matrix
   # Overrides Object#to_s
   #
   def to_s
-    if row_size == 0 || column_size == 0
+    if empty?
       "Matrix.empty(#{row_size}, #{column_size})"
     else
       "Matrix[" + @rows.collect{|row|
@@ -923,7 +931,7 @@ class Matrix
   # Overrides Object#inspect
   #
   def inspect
-    if row_size == 0 || column_size == 0
+    if empty?
       "Matrix.empty(#{row_size}, #{column_size})"
     else
       "Matrix#{@rows.inspect}"
-- 
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