 Usage:  cov=covmlrr(ord,rang,di,tb,te,typ,ytt)  
 
 Input:

  ord                    scalar, model order 
                         
  rang                   scalar, rank of VAR matrix 
                         
  di                     scalar, dimension of time series 
                         
  tb                     scalar, beginning of sample 
                         
  te                     scalar, beginning of sample 
                         
  typ                    scalar, model type 
                         
  ytt                    matrix, transformed time series 
                         
 Output:

  cov                    matrix, covariance matrix 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
