. The third and fourth inputs are placed into
        the third and fourth <span class="emphasis"><em><span class="bold"><strong>R</strong></span></em></span>
        components of the quaternion, respectively.
      </p>
<p>
        <a name="boost_quaternions.quaternions.creation_multipolar"></a> <code class="computeroutput"><span class="identifier">multipolar</span></code> is yet another simple generalization
        of polar coordinates. This time, both <span class="emphasis"><em><span class="bold"><stro