title: Generating Non-Stationary Time Series in R
body: <p>I wish to generate an AR(3) model with parameters (3,0,5) for each of the phi's.
  This is non-stationary and arima.sim gives the error </p>
  
  <pre><code>Error in arima.sim(model = list(ar = c(3, 0, 5)), n = 50) :'ar' part of 
  model is not stationary
  </code></pre>
  
  <p>Is there a way this can be done in R?</p>