">xr</span> <span class="p">=</span> <span class="n">delta</span><span class="p">:</span><span class="n">delta</span><span class="p">:</span><span class="nb">size</span><span class="p">(</span><span class="n">im</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span><span class="o">-</span><span class="n">delta</span><span class="o">+</span><span class="mi">1</span> <span class="p">;</span>
<span class="n">yr</span> <span class="p">=</span> <span class="n">delta</span><span class="p"