title: Varying axis labels formatter per facet in ggplot/R
body: <p>I have a dataframe capturing several measures over time that I would like to visualize a 3x1 facet. However, each measure contains different units/scales that would benefit from custom transformations and labeling schemes.</p>
  
  <p>So, my question is: <strong>If the units and scales are different across different facets, how can I specify a custom formatter or transformation (i.e., log10) to a particular axis within a facet?</strong></p>
  
  <p>For example, let's say I have the data:</p>
  
  <pre><code>df = data.frame(dollars=10^rlnorm(50,0,1), counts=rpois(50, 100))
  melted.df = melt(df, measure.var=c("dollars", "counts"))
  </code></pre>
  
  <p>How would one go upon setting up a 2x1 facet showing dollars and counts over the index with <code>labels=dollars</code> and <code>scale_y_continuous(trans = "log10", ...)</code> for the <code>df$dollars</code> data?</p>
  
  <p>Thank you!</p>