nag_real_symm_general_eigensystem (f02aec) Example Program Results
Eigenvalues
  -3.0000   -1.0000    2.0000    4.0000
Eigenvectors
  -4.3500   -2.0500   -3.9500    2.6500
   0.0500    0.1500    0.8500    0.0500
   1.0000    0.5000    0.5000   -1.0000
  -0.5000   -0.5000   -0.5000    0.5000