title: R ggplot, two scales together
body: <p>I want the y-axis to be scaled:</p>
  
  <ol>
  <li><p>by log10, I used:</p>
  
  <p><strong>scale_y_log10(breaks = trans_breaks("log10",function(x) 10^x))</strong></p></li>
  <li><p>more ticks:</p>
  
  <p><strong>scale_y_continuous(breaks=pretty_breaks(10))</strong></p></li>
  </ol>
  
  <p>But from the error message, there can by only one scale.
  Is there a way to have both of the two scales?</p>