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require File.expand_path('../../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix::LUPDecomposition#u" do
before :each do
@a = Matrix[[7, 8, 9], [14, 46, 51], [28, 82, 163]]
@lu = Matrix::LUPDecomposition.new(@a)
@u = @lu.u
end
it "returns the second element of to_a" do
@u.should == @lu.to_a[1]
end
it "returns an upper triangular matrix" do
@u.upper_triangular?.should be_true
end
end
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