 Usage:  {wr, wi, zr, zi} = eiscg(ar{, ai})  
 
 Input:

  ar                     n x m matrix 
                         
  ai                     n x m matrix 
                         
 Output:

  wr                     n x 1 vector of real eigenvalues 
                         
  wi                     n x 1 vector of imaginary eigenvalues 
                         
  zr                     n x m matrix of real eigenvectors 
                         
  zi                     m x m matrix of imaginary eigenvectors 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
