>Constructor method</h2><pre class="codeinput">    methods
        <span class="keyword">function</span> this = Model_M(printFlag)
            <span class="keyword">if</span> nargin == 0, printFlag = true; <span class="keyword">end</span>
            this = this@Model();
            this.ndof_nd = 2;       <span class="comment">% Number of dofs per node</span>
            this.physics = <span class="string">'M'</span>;     <span class="comment">% Tag with the physics name</span>
            <span class="key