File: l_spec.rb

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require_relative '../../../spec_helper'

ruby_version_is ""..."3.1" do
  require 'matrix'

  describe "Matrix::LUPDecomposition#l" do
    before :each do
      @a = Matrix[[7, 8, 9], [14, 46, 51], [28, 82, 163]]
      @lu = Matrix::LUPDecomposition.new(@a)
      @l = @lu.l
    end

    it "returns the first element of to_a" do
      @l.should == @lu.to_a[0]
    end

    it "returns a lower triangular matrix" do
      @l.lower_triangular?.should be_true
    end
  end
end