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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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1 <p>
2 Transfer functions can be expressed as a quocient of polynomials
3 </p>
4 <br>
5 <div align="center">
6 <img src="images/parfrac_tf_eqn.png" alt="Pole/zero model TF" border="3">
7 </div>
8 <br>
9 <p>
10 The constructor can be used in different ways
11 </p>
12 <h2>From poles and residues</a></h2>
13 <p>
14 The standard way is to input the coefficients of your filter. The constructor
15 accepts as a optional properties the name
16 </p>
17 <br>
18 <div class="fragment"><pre>
19 >> par = parfrac([1 2+1i 2-1i], [6 1+3i 1-3i], [])
20 ---- parfrac 1 ----
21 model: None
22 res: [1;2+i*1;2-i*1]
23 poles: [6;1+i*3;1-i*3]
24 dir: 0
25 pmul: [1;1;1]
26 iunits: []
27 ounits: []
28 -------------------
29 </pre></div>
30 <br>
31 <h2>From partial XML file</a></h2>
32 You can input a XML file containing a transfer function model into the constructor
33 <br>
34 <div class="fragment"><pre>
35 >> par = parfrac('datafile.xml')
36 </pre></div>
37 <br>
38 <h2>From mat file</a></h2>
39 You can input a mat file containing a transfer function model into the constructor
40 <br>
41 <div class="fragment"><pre>
42 >> rat = parfrac('datafile.mat')
43 </pre></div>
44 <br>
45 <h2>From plist</a></h2>
46 All the properties of the filter can be specified in a plist and then passed to the constructor:
47 <br>
48 <div class="fragment"><pre>
49 >> pl = plist('iunits','m','ounits','V','res',[1 2+1i 2-1i],'poles',[6 1+3i 1-3i],...
50 'name','filter_mame');
51 >> par = parfrac(pl)
52 ---- parfrac 1 ----
53 model: filter_mame
54 res: [1;2+i*1;2-i*1]
55 poles: [6;1+i*3;1-i*3]
56 dir: 0
57 pmul: [1;1;1]
58 iunits: [m]
59 ounits: [V]
60 -------------------
61 </pre></div>
62 <br>
63 <h2>From repository</a></h2>
64 Rational transfer function can be obtained from the <a href="repo.html"> repository </a> with the following syntax.
65 <br>
66 <div class="fragment"><pre>
67 >> rat = rational('Hostname','localhost','Database','ltpda',...
68 'ID',[],'CID',[],'Binary',yes)
69 </pre></div>
70 <br>