 Usage:  bb = bgen(b, di, ord)  
 
 Input:

  b                      di*ord+1 vector 
                         
  di                     vector, dimensions 
                         
  ord                    vector, order of series 
                         
 Output:

  bb                     vector 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
