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<table border="0" summary="Simple list" class="simplelist_nottable_last">
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    <td>
      <a href="constructor_examples_general.html#copy">Copy a symbolic model object</a>
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    <td>
      <a href="constructor_examples_general.html#empty">Construct an empty symbolic model object</a>
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    <td>
      <a href="constructor_examples_general.html#zero">Construct an empty symbolic model object with the size zero</a>
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    <td>
      <a href="constructor_examples_general.html#file">Construct a symbolic model object by loading the object from a file</a>
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    <td>
      <a href="#simple">Construct a simple example</a>
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    <td>
      <a href="matlab:web(smodel.getInfo('smodel').tohtml, '-helpbrowser')">Construct an LTPDA object from a parameter list object (PLIST)</a>
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<hr>
<h2 class="title"><a name="simple"></a>A simple example</h2>
<p>The following example shows you how to create a symbolic model.</p>
<div class="fragment"><pre class="programlisting">
>> s = smodel(<span class="string">'a.*x.^2+b.*x+c'</span>);
</pre></div>
<p>You define with the command above the symbolic model. Please take care that each symbolic can represent a vector/matrix of numbers. 
This mean that you should use the array operators like '.*' or '.+' or ... and not the matrix operators like '*' or '^' or ....</p>
<p>Now, it is necessary to define the parameters with their default values</p>
<div class="fragment"><pre class="programlisting">
>> s.setParams({<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>}, {1 2 3})
   ---- symbolic model 1 ----
          name: None
          expr: a.*x.^2+b.*x+c
        params: {'a', 'b', 'c'}
        values: {1, 2, 3}
          xvar: 
         xvals: []
        xunits: []
        yunits: []
   description: 
          UUID: 7a084750-89c2-47f0-8c6b-65e9079bf6b3
   --------------------------
</pre></div>
<p>Finally it is necessary to set the 'x' variable and the values.</p>
<div class="fragment"><pre class="programlisting">
>> s.setXvar(<span class="string">'x'</span>)
   ---- symbolic model 1 ----
          name: None
          expr: a.*x.^2+b.*x+c
        params: {'a', 'b', 'c'}
        values: {1, 2, 3}
          xvar: x
         xvals: []
        xunits: []
        yunits: []
   description: 
          UUID: ca9276b0-cc97-4001-9135-00c6799ec8b1
   --------------------------

>> s.setXvals(-100:100)
   ---- symbolic model 1 ----
          name: None
          expr: a.*x.^2+b.*x+c
        params: {'a', 'b', 'c'}
        values: {1, 2, 3}
          xvar: x
         xvals: [-100 -99 -98 -97 -96 -95 -94 -93 -92 -91 -90 -89 -88 -87 -86 ...]
        xunits: []
        yunits: []
   description: 
          UUID: f43e2f9b-3fb6-4e3c-92ba-7cba31c6a6c3
   --------------------------
</pre></div>
<p>After all steps above it is possible to plot the model.</p>
<div class="fragment"><pre class="programlisting">
>> s.setXunits(<span class="string">'s'</span>);
>> s.setYunits(<span class="string">'V'</span>);
>> s.setName(<span class="string">'Just a test'</span>);
>> iplot(s.eval)
</pre></div>

<img src="images/constructor_examples_smodel_plot.png" alt="Plot of symbolic model" border="3" width="800px"></img>