title: How to add properties of von Mises circular distribution data to my data
body: <p>When I generate von Mises circular distribution data...</p>
  
  <pre><code>dummy.data &lt;- rvonmises(n=10, mu=circular(0), kappa=0)
  </code></pre>
  
  <p>...I can make radial plot (by <code>plot(dummy.data)</code>) because the <code>rvonmises</code> function generates not only the vales but also <strong>data properties</strong>:</p>
  
  <pre><code>str(dummy.data)
  Classes 'circular', 'numeric'  atomic [1:10] 2.04 2.633 0.54 0.776 0.353 ...
    ..- attr(*, "circularp")=List of 6
    .. ..$ type    : chr "angles"
    .. ..$ units   : chr "radians"
    .. ..$ template: chr "none"
    .. ..$ modulo  : chr "asis"
    .. ..$ zero    : num 0
    .. ..$ rotation: chr "counter"
  </code></pre>
  
  <p><strong>How can I create (transfer?) these properties to my real life data stored in vector format?</strong></p>
  
  <p>Because when I try to plot my data, I can get only ordinary xyplot.</p>
  
  <pre><code>radian.values &lt;- seq(from = 0, to  = 2*pi, length = 250)
  my.data &lt;- sample(radian.values, 500, replace = TRUE)
  plot(my.data) # ordinary xyplot.... :(
  </code></pre>