>)</span><span class="o">*</span><span class="n">X_Y</span><span class="p">(</span><span class="n">pp</span><span class="p">))</span>
       <span class="n">Y_PHI</span><span class="p">(</span><span class="n">pp</span><span class="p">)</span> <span class="o">=</span> <span class="n">ATAN2</span><span class="p">(</span><span class="n">X_Y</span><span class="p">(</span><span class="n">pp</span><span class="p">),</span> <span class="n">X_X</span><span class="p">(</span><span class="n">pp</span><span class="p">