--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/html_help/help/ug/convert_models_content.html	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,34 @@
+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 
+between the different representations. In the current LTPDA version, this applies 
+for pole/zero model and rational representation. Following versions will cover the 
+partial fraction representation. This is shown in the following transformation table:
+
+<div align="center">
+  <img src="images/TransformTable.png" alt="Pole/zero model TF" border="3">
+</div>
+
+<h2>From pzmodel to rational</a></h2>
+You can transform a <tt>pzmodel</tt> into a <tt>rational</tt> by typing: 
+<br>
+<div class="fragment"><pre>
+    >> rat   = rational(pzmodel)
+</pre></div>
+<br>
+
+<h2>From rational to pzmodel</a></h2>
+You can transform a <tt>rational</tt> into a <tt>pzmodel</tt> by typing: 
+<br>
+<div class="fragment"><pre>
+    >> rat   = pzmodel(rational)
+</pre></div>  
+<br>
+
+<h2>Algorithm</a></h2>
+To translate from <tt>rational</tt> to <tt>pzmodel</tt> representation we need to 
+compute the roots of a polynomial and the inverse operation is performed going from 
+<tt>pzmodel</tt> to <tt>rational</tt>. More information about the algorithm used can be 
+found in MATLAB's functions <a href="matlab:doc('poly')">poly</a> and 
+<a href="matlab:doc('roots')">roots</a>.
+
+