 Usage:  y = genarma(a, b, eps)  
 
 Input:

  a                      p-vector of autoregressive parameters 
                         
  b                      q-vector of moving average parameters 
                         
  eps                    n-vector of noise 
                         
 Output:

  y                      n-vector, the ARMA process 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
