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