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require File.expand_path('../../../../spec_helper', __FILE__)
require 'matrix'
describe "Matrix::EigenvalueDecomposition#eigenvalues" do
it "returns an array of complex eigenvalues for a rotation matrix" do
Matrix[[ 1, 1],
[-1, 1]].eigensystem.eigenvalues.sort_by{|v| v.imag}.should ==
[ Complex(1, -1), Complex(1, 1)]
end
it "returns an array of real eigenvalues for a symetric matrix" do
Matrix[[1, 2],
[2, 1]].eigensystem.eigenvalues.sort.map!{|x| x.round(10)}.should ==
[ -1, 3 ]
end
it "returns an array of real eigenvalues for a matrix" do
Matrix[[14, 16],
[-6, -6]].eigensystem.eigenvalues.sort.map!{|x| x.round(10)}.should ==
[ 2, 6 ]
end
end
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