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<a name="Creating-a-classdef-Class"></a>
<div class="header">
<p>
Next: <a href="Properties.html#Properties" accesskey="n" rel="next">Properties</a>, Up: <a href="classdef-Classes.html#classdef-Classes" accesskey="u" rel="up">classdef Classes</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Creating-a-classdef-Class-1"></a>
<h4 class="subsection">34.6.1 Creating a <code>classdef</code> Class</h4>

<p>A very basic <code>classdef</code> value class
(see <a href="Value-Classes-vs_002e-Handle-Classes.html#Value-Classes-vs_002e-Handle-Classes">Value Classes vs. Handle Classes</a>) is defined by:
</p>
<div class="example">
<pre class="example">classdef some_class
  properties
  endproperties

  methods
  endmethods
endclassdef
</pre></div>



<p>In contrast to old style classes, the <code>properties</code>-<code>endproperties</code>
block as well as the <code>methods</code>-<code>endmethods</code> block can be used to
define properties and methods of the class.  Because both blocks are empty,
they can be omitted in this particular case.
</p>
<p>For simplicity, a more advanced implementation of a <code>classdef</code> class is
shown using the <code>polynomial</code> example again (see <a href="Creating-a-Class.html#Creating-a-Class">Creating a Class</a>):
</p>
<div class="example">
<pre class="verbatim">classdef polynomial2
  properties
    poly = 0;
  endproperties

  methods
    function p = polynomial2 (a)
      if (nargin &gt; 1)
        print_usage ();
      endif

      if (nargin == 1)
        if (isa (a, &quot;polynomial2&quot;))
          p.poly = a.poly;
        elseif (isreal (a) &amp;&amp; isvector (a))
          p.poly = a(:).';  # force row vector
        else
          error (&quot;polynomial2: A must be a real vector&quot;);
        endif
      endif
    endfunction

    function disp (p)
      a = p.poly;
      first = true;
      for i = 1 : length (a);
        if (a(i) != 0)
          if (first)
            first = false;
          elseif (a(i) &gt; 0 || isnan (a(i)))
            printf (&quot; +&quot;);
          endif
          if (a(i) &lt; 0)
            printf (&quot; -&quot;);
          endif
          if (i == 1)
            printf (&quot; %.5g&quot;, abs (a(i)));
          elseif (abs (a(i)) != 1)
            printf (&quot; %.5g *&quot;, abs (a(i)));
          endif
          if (i &gt; 1)
            printf (&quot; X&quot;);
          endif
          if (i &gt; 2)
            printf (&quot; ^ %d&quot;, i - 1);
          endif
        endif
      endfor

      if (first)
        printf (&quot; 0&quot;);
      endif
      printf (&quot;\n&quot;);
    endfunction
  endmethods
endclassdef
</pre></div>

<p>An object of class <code>polynomial2</code> is created by calling the class
constructor:
</p>
<div class="example">
<pre class="example">&gt;&gt; p = polynomial2 ([1, 0, 1])
&rArr; p =

 1 + X ^ 2
</pre></div>




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