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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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1 <!-- $Id: constructor_examples_param_content.html,v 1.4 2008/04/01 12:46:21 ingo Exp $ -->
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2
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3 <!-- -------------------------------------------------- -->
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4 <!-- --------------- BEGIN CONTENT FILE --------------- -->
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5 <!-- -------------------------------------------------- -->
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6
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7 <table border="0" summary="Simple list" class="simplelist_nottable_last">
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8 <tr>
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9 <td>
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10 <a href="constructor_examples_param.html#general">General Information of the PARAM object constructor</a>
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11 </td>
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12 </tr>
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13 <tr>
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14 <td>
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15 <a href="constructor_examples_param.html#empty">Construct empty PARAM object</a>
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16 </td>
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17 </tr>
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18 <tr>
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19 <td>
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20 <a href="constructor_examples_param.html#xml_file">Construct a PARAM object by loading the object from a file</a>
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21 </td>
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22 </tr>
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23 <tr>
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24 <td>
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25 <a href="constructor_examples_param.html#plist">Construct a PARAM object from a parameter list (PLIST) object</a>
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26 </td>
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27 </tr>
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28 </table>
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29
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30
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31 <!-- From parameters -->
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32 <hr>
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33 <h2 class="title"><a name="general"></a>General Information of the PARAM object constructor</h2>
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34 <p>
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35 Parameter objects are used in the LTPDA Toolbox to configure the behaviour of algorithms. A
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36 parameter (<tt>param</tt>) object has two main properties:
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37 <ul>
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38 <li><tt>'key'</tt> &mdash; The parameter name</li>
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39 <li><tt>'val'</tt> &mdash; The parameter value</li>
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40 </ul>
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41 See <a href="class_desc_param.html">param class</a> for further details. The 'key' property is always stored in upper case. The 'value' of a parameter can be any LTPDA object, as well as most standard MATLAB types.
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42 </p>
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43 <p>
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44 Parameter values can take any form: vectors or matrices of numbers; strings; other objects,
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45 for example a <tt>specwin</tt> (spectral window) object.
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46 </p>
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47 <p>
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48 Parameters are created using the <tt>param</tt> class constructor. The following code shows
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49 how to create a parameter 'a' with a value of 1
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50 </p>
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51 <div class="fragment"><pre>
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52 >> p = param(<span class="string">'a'</span>, 1)
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53 ---- param 1 ----
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54 key: a
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55 val: 1
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56 -----------------
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57 </pre></div>
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58 <p>
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59 The contents of a parmeter object can be accessed as follows:
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60 </p>
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61 <div class="fragment"><pre>
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62 >> key = p.key; <span class="comment">% get the parameter key</span>
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63 >> val = p.val; <span class="comment">% get the parameter value</span>
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64 </pre></div>
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65
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66 <!-- --------------- NEXT EXAMPLE --------------- -->
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67
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68 <hr>
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69 <h2 class="title"><a name="empty"></a>Construct empty PARAM object</h2>
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70 <p>The following example creates an empty param object</p>
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71 <div class="fragment"><pre class="programlisting">
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72 p = param()
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73 ---- param 1 ----
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74 key:
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75 val: []
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76 -----------------
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77 </pre></div>
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78
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79 <!-- --------------- NEXT EXAMPLE --------------- -->
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80
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81 <hr>
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82 <h2 class="title"><a name="xml_file"></a>Construct a PARAM object by loading the object from a file</h2>
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83 <p>The following example creates a new param object by loading the param object from disk.</p>
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84 <div class="fragment"><pre class="programlisting">
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85 p = param(<span class="string">'param.mat'</span>)
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86 p = param(<span class="string">'param.xml'</span>)
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87 </pre></div>
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88
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89 <!-- --------------- NEXT EXAMPLE --------------- -->
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90
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91 <hr>
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92 <h2 class="title"><a name="plist"></a>Construct a PARAM object from a parameter list (PLIST) object</h2>
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93 <p>To construct a PARAM object with a PLIST object it is necessarc to use the key-words 'key' and 'val'</p>
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94 <div class="fragment"><pre class="programlisting">
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95 pl = plist(<span class="string">'key'</span>, <span class="string">'my_key'</span>, <span class="string">'val'</span>, <span class="string">'my_value'</span>);
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96
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97 p = param(pl)
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98 </pre></div>
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99
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100 <!-- -------------------------------------------------- -->
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101 <!-- ---------------- END CONTENT FILE ---------------- -->
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102 <!-- -------------------------------------------------- -->