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require File.expand_path('../../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix::LUPDecomposition#p" do
before :each do
@a = Matrix[[7, 8, 9], [14, 46, 51], [28, 82, 163]]
@lu = Matrix::LUPDecomposition.new(@a)
@p = @lu.p
end
it "returns the third element of to_a" do
@p.should == @lu.to_a[2]
end
it "returns a permutation matrix" do
@p.permutation?.should be_true
end
end
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