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<div class="textblock"><p>Section: <a class="el" href="sec_class.html">Object Oriented Programming</a> </p>
<h1><a class="anchor" id="Usage"></a>
Usage</h1>
<p>When designing a constructor for a FreeMat class, you should design the constructor to take a certain form. The following is the code for the sample <code>mat</code> object </p>
<pre class="fragment">function p = mat(a)
if (nargin == 0)
p.c = [];
p = class(p,'mat');
elseif isa(a,'mat')
p = a;
else
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</pre><p> Generally speaking when it is provided with zero arguments, the constructor returns a default version of the class using a template structure with the right fields populated with default values. If the constructor is given a single argument that matches the class we are trying to construct, the constructor passes through the argument. This form of the constructor is used for type conversion. In particular, </p>
<pre class="fragment"> p = mat(a)
</pre><p> guarantees that <code>p</code> is an array of class <code>mat</code>. The last form of the constructor builds a class object given the input. The meaning of this form depends on what makes sense for your class. For example, for a polynomial class, you may want to pass in the coefficients of the polynomial. </p>
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