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<div class="subsection" id="Creating-a-classdef-Class">
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<p>
Next: <a href="Properties.html" accesskey="n" rel="next">Properties</a>, Up: <a href="classdef-Classes.html" accesskey="u" rel="up"><code>classdef</code> Classes</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
<span id="Creating-a-classdef-Class-1"></span><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. 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</a>):
</p>
<div class="example">
<pre class="verbatim">classdef polynomial2
properties
poly = 0;
endproperties
methods
function p = polynomial2 (a)
if (nargin == 1)
if (isa (a, "polynomial2"))
p.poly = a.poly;
elseif (isreal (a) && isvector (a))
p.poly = a(:).'; # force row vector
else
error ("polynomial2: A must be a real vector");
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) > 0 || isnan (a(i)))
printf (" +");
endif
if (a(i) < 0)
printf (" -");
endif
if (i == 1)
printf (" %.5g", abs (a(i)));
elseif (abs (a(i)) != 1)
printf (" %.5g *", abs (a(i)));
endif
if (i > 1)
printf (" X");
endif
if (i > 2)
printf (" ^ %d", i - 1);
endif
endif
endfor
if (first)
printf (" 0");
endif
printf ("\n");
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">>> p = polynomial2 ([1, 0, 1])
⇒ p =
1 + X ^ 2
</pre></div>
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