title: R -- remove ticks from pie chart
body: <p>I'd like to remove the tick marks from a pie chart created in base graphics in R.</p>
  
  <pre><code>pie(x=rep(1, 12), labels=c("Jan", "Feb", "Mar", "Apr",
                         "May", "Jun", "Jul", "Aug",
                         "Sep", "Oct", "Nov", "Dec"),
  col = rainbow(12),
  border=NA) 
  </code></pre>
  
  <p>The pie function doesn't seem to accept any of the graphical parameters in par() that would do this.</p>