 Usage:  y = eiggn (x {,xi})  
 
 Input:

  x                      p x p matrix (real part of matrix) 
                         
  xi                     p x p matrix (imaginary part of matrix) 
                         
 Output:

  y.values.re            p x 1 vector with the real eigenvalues 
                         
  y.values.im            p x 1 vector with the imaginary eigenvalues 
                         
  y.vectors.re           p x p matrix with the real eigenvectors 
                         
  y.vectors.im           p x p matrix with the imaginary eigenvectors 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
