 Usage:  roots=rootsci(ord,di,tb,te,typ,ytt)  
 
 Input:

  ord                    integer, VAR order 
                         
  di                     integer, dimension of time series 
                         
  tb                     integer, beginning of sample 
                         
  te                     integer, end of sample 
                         
  typ                    integer, model type 
                         
  ytt                    matrix, time series 
                         
 Output:

  roots                  matrix of characteristic roots 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
