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+
+<p>
+  Transfer functions can be expressed as a quocient of polynomials as in the following expression
+</p>
+<br>
+<div align="center">
+  <img src="images/rational_tf_eqn.png" alt="Pole/zero model TF" border="3">
+</div>
+<br>
+<p>
+  The constructor can be used in different ways
+</p>
+<h2>From coefficients</a></h2>
+<p>
+  The standard way is to input the coefficients of your filter. The constructor
+  accepts as a optional properties the name
+</p>
+<br>
+<div class="fragment"><pre>
+    >> rat   = rational([1 3 5 7],[5 10 0.01],'filter_name')
+    ---- rational 1 ----
+    model:    filter_name
+    num:      [1 3 5 7]
+    den:      [5 10 0.01]
+    iunits:   []
+    ounits:   []
+    --------------------
+</pre></div>
+<br>
+<h2>From partial XML file</a></h2>
+You can input a XML file containing a transfer function model into the constructor
+<br>
+<div class="fragment"><pre>
+    >> rat   = rational('datafile.xml')
+</pre></div>
+<br>
+<h2>From mat file</a></h2>
+You can input a mat file containing a transfer function model into the constructor
+<br>
+<div class="fragment"><pre>
+    >> rat   = rational('datafile.mat')
+</pre></div>
+<br>
+<h2>From plist</a></h2>
+All the properties of the filter can be specified in a plist and then passed to the constructor:
+<br>
+<div class="fragment"><pre>
+    >> pl = plist('iunits','m','ounits','V','num',[1 3 10],'den',[4 6],...
+    'name','filter_mame');
+    >> par   = parfrac(pl)
+    ---- rational 1 ----
+    model:    filter_mame
+    num:      [1 3 10]
+    den:      [4 6]
+    iunits:   [m]
+    ounits:   [V]
+    --------------------
+</pre></div>
+<br>
+<h2>From repository</a></h2>
+Rational transfer function can be obtained from the <a href="repo.html"> repository </a> with the following syntax.
+<br>
+<div class="fragment"><pre>
+    >> rat   = rational('Hostname','localhost','Database','ltpda',...
+    'ID',[],'CID',[],'Binary',yes)
+</pre></div>
+<br>