n><span class="p">(</span><span class="n">theta</span><span class="p">)</span>
                <span class="n">right_mats</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">v1t</span><span class="p">)</span>
                <span class="n">right_mats</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">v2t</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">left_mats</span><span cla