title: graph 95th percentile
body: <p>I have a time series data that can plot using:</p>
  
  <pre><code>plot(x$numbers, type="l", col="blue")
  </code></pre>
  
  <p>I like to get the 95th percentile and add this 95th percentile to this graph</p>
  
  <pre><code>x_percent&lt;-quantile(x$numbers, 0.95)
  </code></pre>
  
  <p>How do I add x_percent to the existing graph of x$numbers?</p>
  
  <pre><code>x$numbers&lt;-c(1,2,3,8,10,30)
  x$percent&lt;-quantile(x$numbers, 0.95)
  plot(x$numbers, type="l")
  </code></pre>
  
  <p>here, I like to add the x$percent to the graph, basically draw a vertical line with the value of 95th percentile value.
  andy ideas?</p>