<p>
  	Poles and zeros are treated the same with regards creation, so we will look here at poles only. The
  	meaning of a pole and a zero only becomes important when creating a pole/zero model.
  </p>
  <p>
	Poles are specified by in the LTPDA Toolbox by a frequency, <i>f</i>, and (optionally) a quality 
	factor, <i>Q</i>, or by a complex number.
  </p>
  <p>
	The following code fragment creates a real pole at 1Hz:
  </p>
  <div class="fragment"><pre>
  	>> pz(1)
------ pz/1 -------
      f: 1
      q: NaN
     ri: -6.28318530717959
version: $Id: pzmodel_pz_content.html,v 1.3 2009/02/18 12:15:16 hewitson Exp $
-------------------
  </pre></div>
  <p>
    To create a complex pole, you can specify a quality factor. For example,
  </p>
  <div class="fragment"><pre>
   >> pz(1,4)
------ pz/1 -------
      f: 1
      q: 4
     ri: [0.785398163397448+i*6.23390466154956;0.785398163397448-i*6.23390466154956]
version: $Id: pzmodel_pz_content.html,v 1.3 2009/02/18 12:15:16 hewitson Exp $
-------------------
  </pre></div>
  <p>
    This creates a complex pole at 1Hz with a <i>Q</i> of 4. You can also see that the complex representation
    is also shown, but only one part of the conjugate pair.
  </p>