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Diffstat (limited to 'spec/ruby/library/matrix/rank_spec.rb')
| -rw-r--r-- | spec/ruby/library/matrix/rank_spec.rb | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/spec/ruby/library/matrix/rank_spec.rb b/spec/ruby/library/matrix/rank_spec.rb new file mode 100644 index 0000000000..42b6de1ab8 --- /dev/null +++ b/spec/ruby/library/matrix/rank_spec.rb @@ -0,0 +1,19 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require 'matrix' + +describe "Matrix#rank" do + it "returns the rank of the Matrix" do + Matrix[ [7,6], [3,9] ].rank.should == 2 + end + + it "doesn't loop forever" do + Matrix[ [1,2,3], [4,5,6], [7,8,9] ].rank.should == 2 + Matrix[ [1, 2, 0, 3], [1, -2, 3, 0], [0, 0, 4, 8], [2, 4, 0, 6] ].rank. + should == 3 + end + + it "works for some easy rectangular matrices" do + Matrix[[0,0],[0,0],[1,0]].rank.should == 1 + Matrix[[0,1],[0,0],[1,0]].rank.should == 2 + end +end |