>
       
        <span class="n">jabr_theta</span><span class="p">,</span> <span class="n">jabr_r</span> <span class="o">=</span> <span class="n">math</span><span class="o">.</span><span class="n">cart2pol</span><span class="p">(</span><span class="n">jabr</span><span class="p">[</span><span class="o">...</span><span class="p">,</span><span class="mi">1</span><span class="p">:</span><span class="mi">3</span><span class="p">],</span> <span class="n">htype</span> <span class="o">=</span> <span class="s1">&#3