title: R plot to show mutation
body: <p>I'm new in R. I'd like to draw figures like this (lower left part):
  <a href="http://www.nature.com/ng/journal/v45/n8/images_article/ng.2699-F3.jpg" rel="nofollow">http://www.nature.com/ng/journal/v45/n8/images_article/ng.2699-F3.jpg</a>,</p>
  
  <p>to show the co-existing or exclusive of mutations (one gene per line and one sample per column). I don't think it's plotted by 
      heatmap or 
      pheatmap. 
  And here is a sample data (1 for mutation, 0 for wildtype and NA for not available):</p>
  
  <pre><code>data=matrix(sample(c(rep(0,30),rep(1,30)),60),ncol=15)
  is.na(data)=c(2,20)
  </code></pre>
  
  <p>Any suggestions on how to finish that? Thanks~</p>