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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
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