title: MATLAB: step responce of a system with complex data
body: <p>I'm trying to have step response for a system with complex data. I have this error:</p>
  
  <blockquote>
    <p>"Cannot simulate the time response of LTI models with complex data."</p>
  </blockquote>
  
  <p>How can I have this response? this is my transfer function:</p>
  
  <pre><code>           (4.266-0.5157i) s^2 + (8.532-1.031i) s + (1.706-0.2063i)
   G(s) = --------------------------------------------------------------
          s^3 + (4.266-0.5157i) s^2 + (8.532-1.031i) s + (1.706-0.2063i)
  </code></pre>