], &#39;C&#39;)</span>

                <span class="n">x11</span> <span class="o">=</span> <span class="n">mat</span><span class="p">[</span><span class="mi">0</span><span class="p">:</span><span class="n">hdim</span><span class="p">,</span> <span class="mi">0</span><span class="p">:</span><span class="n">hdim</span><span class="p">]</span>
                <span class="n">x12</span> <span class="o">=</span> <span class="n">mat</span><span class="p">[</span><span class="mi">0</span><span class="p">:</span><