+
−The different constructors from each transfer function representations accept as 
+
−an input a model from a another representation so that they can all be converted 
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−between the different representations. In the current LTPDA version, this applies 
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−for pole/zero model and rational representation. Following versions will cover the 
+
−partial fraction representation. This is shown in the following transformation table:
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−
+
−<div align="center">
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−  <img src="images/TransformTable.png" alt="Pole/zero model TF" border="3">
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−</div>
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−
+
−<h2>From pzmodel to rational</a></h2>
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−You can transform a <tt>pzmodel</tt> into a <tt>rational</tt> by typing: 
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−<br>
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−<div class="fragment"><pre>
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−    >> rat   = rational(pzmodel)
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−</pre></div>
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−<br>
+
−
+
−<h2>From rational to pzmodel</a></h2>
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−You can transform a <tt>rational</tt> into a <tt>pzmodel</tt> by typing: 
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−<br>
+
−<div class="fragment"><pre>
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−    >> rat   = pzmodel(rational)
+
−</pre></div>  
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−<br>
+
−
+
−<h2>Algorithm</a></h2>
+
−To translate from <tt>rational</tt> to <tt>pzmodel</tt> representation we need to 
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−compute the roots of a polynomial and the inverse operation is performed going from 
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−<tt>pzmodel</tt> to <tt>rational</tt>. More information about the algorithm used can be 
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−found in MATLAB's functions <a href="matlab:doc('poly')">poly</a> and 
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−<a href="matlab:doc('roots')">roots</a>.
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−
+
−