n class="comment">% Delete interaction object</span>
                            delete(int);
                            rmv = true;
                        <span class="keyword">end</span>
                    <span class="keyword">else</span>
                        <span class="comment">% Create new particle-wall interaction if needed</span>
                        this.createInteractPW(drv,p1,w,true);
                    <span class="keyword">end</span>
                <span class="keyword">end</span>
 