title: R Clusplot: How to represent clusters as numbers rather than shapes
body: <p>I want to plot my k means cluster on a 2d plot using clusplot(). However, the points are represented as different shapes on my plot (triangle, square, circle, etc) and it's not easy to see what each shape represents. Is there a way to either generate a legend or change the plot such that it's plotting the cluster assignment rather than a shape?</p>
  
  <pre><code>clusplot(data, myclus$cluster, color=TRUE, shade=TRUE, labels=2, lines=0)
  </code></pre>