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+<p>
+  Transfer functions can be expressed as a quocient of polynomials
+</p>
+<br>
+<div align="center">
+  <img src="images/parfrac_tf_eqn.png" alt="Pole/zero model TF" border="3">
+</div>
+<br>
+<p>
+  The constructor can be used in different ways
+</p>
+<h2>From poles and residues</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>
+    >> par = parfrac([1 2+1i 2-1i], [6 1+3i 1-3i], [])
+    ---- parfrac 1 ----
+    model:    None
+    res:      [1;2+i*1;2-i*1]
+    poles:    [6;1+i*3;1-i*3]
+    dir:      0
+    pmul:     [1;1;1]
+    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>
+    >> par   = parfrac('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   = parfrac('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','res',[1 2+1i 2-1i],'poles',[6 1+3i 1-3i],...
+    'name','filter_mame');
+    >> par = parfrac(pl)
+    ---- parfrac 1 ----
+    model:    filter_mame
+    res:      [1;2+i*1;2-i*1]
+    poles:    [6;1+i*3;1-i*3]
+    dir:      0
+    pmul:     [1;1;1]
+    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>