P</span></span></span>
<span class="r-in"><span><span class="va">Z</span> <span class="op">&lt;-</span> <span class="va">polar_x</span><span class="op">$</span><span class="va">Z</span></span></span>
<span class="r-in"><span><span class="va">P</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>          [,1]     [,2]</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1,] 3.974074 4.382549</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [2,] 4.382549 6.065745