title: R and ggplot2: scale_x_continuous(trans = "log") with tick labels that are not in logs
body: <p>I would like to create a plot with <code>ggplot2</code> that has a x-axis in logs but with the x tick labels not in logs. To make it clear:</p>
  
  <p>Suppose there is some x value 10. Since I use <code>scale_x_continuous(trans = "log")</code> it would appear as 2.3 on the x axis (<code>log(10) = 2.302585</code>). But instead I want that the number 10 appears since I only use <code>scale_x_continuous(trans = "log")</code> in order to improve the comparability of two density plots, that are very skewed.</p>