>Constructor method</h2><pre class="codeinput">    methods
        <span class="keyword">function</span> this = Nusselt(type)
            <span class="keyword">if</span> (nargin &gt; 0)
                this.type = type;
            <span class="keyword">end</span>
        <span class="keyword">end</span>
    <span class="keyword">end</span>
</pre><h2 id="5">Abstract methods: implemented in derived sub-classes</h2><pre class="codeinput">    methods (Abstract)
        <span class="comment">%------------------