 Usage:  iaf = impres(a,t)  
 
 Input:

  a                      (KxK*p)-matrix of model parameters 
                         
  t                      scalar, time horizon for impulse response analysis 
                         
 Output:

  iaf                    (t+1xK^2)-matrix of forecast error impulse responses 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
