           <span class="n">vprev</span> <span class="o">=</span> <span class="n">v</span>
            <span class="n">v</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">divide</span><span class="p">(</span><span class="n">em</span><span class="p">,</span> <span class="n">np</span><span class="o">.</span><span class="n">dot</span><span class="p">(</span><span class="n">K</span><span class="o">.</span><span class="n">T</span><span class="p">,</span> <span class=