diff options
Diffstat (limited to 'spec/rubyspec/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb')
-rw-r--r-- | spec/rubyspec/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/spec/rubyspec/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb b/spec/rubyspec/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb new file mode 100644 index 0000000000..c175a29947 --- /dev/null +++ b/spec/rubyspec/library/matrix/eigenvalue_decomposition/eigenvalues_spec.rb @@ -0,0 +1,22 @@ +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 |