+
−<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>