code: public Complex_F64 getEigenvalue(int index ) {
          if( is64 )
              return ((EigenDecomposition_F64)eig).getEigenvalue(index);
          else {
              Complex_F64 c = ((EigenDecomposition_F64)eig).getEigenvalue(index);
              return new Complex_F64(c.real, c.imaginary);
          }
      }
docs: <p>
  Returns an eigenvalue as a complex number.  For symmetric matrices the returned eigenvalue will always be a real
  number, which means the imaginary component will be equal to zero.
  </p>
  
  <p>
  NOTE: The order of the eigenvalues is dependent upon the decomposition algorithm used.  This means that they may
  or may not be ordered by magnitude.  For example the QR algorithm will returns results that are partially
  ordered by magnitude, but this behavior should not be relied upon.
  </p>
  
  @param index Index of the eigenvalue eigenvector pair.
  @return An eigenvalue.