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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 18:04:34 +0100
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1 <!-- $Id: constructor_examples_smodel_content.html,v 1.1 2009/09/30 21:39:43 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
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8 <!-- --------------- Link box: begin --------------- -->
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9 <table border="0" summary="Simple list" class="simplelist_nottable_last">
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10 <tr>
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11 <td>
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12 <a href="constructor_examples_general.html#copy">Copy a symbolic model object</a>
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13 </td>
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14 </tr>
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15 <tr>
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16 <td>
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17 <a href="constructor_examples_general.html#empty">Construct an empty symbolic model object</a>
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18 </td>
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19 </tr>
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20 <tr>
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21 <td>
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22 <a href="constructor_examples_general.html#zero">Construct an empty symbolic model object with the size zero</a>
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23 </td>
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24 </tr>
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25 <tr>
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26 <td>
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27 <a href="constructor_examples_general.html#file">Construct a symbolic model object by loading the object from a file</a>
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28 </td>
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29 </tr>
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30 <tr>
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31 <td>
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32 <a href="#simple">Construct a simple example</a>
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33 </td>
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34 </tr>
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35 <tr>
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36 <td>
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37 <a href="matlab:web(smodel.getInfo('smodel').tohtml, '-helpbrowser')">Construct an LTPDA object from a parameter list object (PLIST)</a>
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38 </td>
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39 </tr>
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40 </table>
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41
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42 <!-- --------------- NEXT EXAMPLE --------------- -->
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43
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44 <hr>
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45 <h2 class="title"><a name="simple"></a>A simple example</h2>
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46 <p>The following example shows you how to create a symbolic model.</p>
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47 <div class="fragment"><pre class="programlisting">
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48 >> s = smodel(<span class="string">'a.*x.^2+b.*x+c'</span>);
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49 </pre></div>
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50 <p>You define with the command above the symbolic model. Please take care that each symbolic can represent a vector/matrix of numbers.
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51 This mean that you should use the array operators like '.*' or '.+' or ... and not the matrix operators like '*' or '^' or ....</p>
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52 <p>Now, it is necessary to define the parameters with their default values</p>
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53 <div class="fragment"><pre class="programlisting">
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54 >> s.setParams({<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>}, {1 2 3})
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55 ---- symbolic model 1 ----
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56 name: None
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57 expr: a.*x.^2+b.*x+c
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58 params: {'a', 'b', 'c'}
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59 values: {1, 2, 3}
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60 xvar:
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61 xvals: []
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62 xunits: []
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63 yunits: []
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64 description:
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65 UUID: 7a084750-89c2-47f0-8c6b-65e9079bf6b3
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66 --------------------------
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67 </pre></div>
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68 <p>Finally it is necessary to set the 'x' variable and the values.</p>
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69 <div class="fragment"><pre class="programlisting">
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70 >> s.setXvar(<span class="string">'x'</span>)
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71 ---- symbolic model 1 ----
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72 name: None
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73 expr: a.*x.^2+b.*x+c
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74 params: {'a', 'b', 'c'}
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75 values: {1, 2, 3}
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76 xvar: x
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77 xvals: []
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78 xunits: []
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79 yunits: []
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80 description:
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81 UUID: ca9276b0-cc97-4001-9135-00c6799ec8b1
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82 --------------------------
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83
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84 >> s.setXvals(-100:100)
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85 ---- symbolic model 1 ----
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86 name: None
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87 expr: a.*x.^2+b.*x+c
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88 params: {'a', 'b', 'c'}
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89 values: {1, 2, 3}
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90 xvar: x
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91 xvals: [-100 -99 -98 -97 -96 -95 -94 -93 -92 -91 -90 -89 -88 -87 -86 ...]
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92 xunits: []
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93 yunits: []
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94 description:
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95 UUID: f43e2f9b-3fb6-4e3c-92ba-7cba31c6a6c3
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96 --------------------------
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97 </pre></div>
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98 <p>After all steps above it is possible to plot the model.</p>
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99 <div class="fragment"><pre class="programlisting">
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100 >> s.setXunits(<span class="string">'s'</span>);
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101 >> s.setYunits(<span class="string">'V'</span>);
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102 >> s.setName(<span class="string">'Just a test'</span>);
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103 >> iplot(s.eval)
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104 </pre></div>
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105
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106 <img src="images/constructor_examples_smodel_plot.png" alt="Plot of symbolic model" border="3" width="800px"></img>
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107
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108
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109
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110
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111
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112
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