title: Plot with multiple breaks of different sizes
body: <p>I would like to create a plot with multiple breaks of different sized intervals on the y axis. The closest post I could find is this <a href="https://stackoverflow.com/questions/19212874/show-customised-x-axis-ticks-in-ggplot2">Show customised X-axis ticks in ggplot2</a> But it doesn't fully solve my problem.</p>
  
  <pre><code> # dummy data
  
   require(ggplot2)
   require(reshape2)
  
   a&lt;-rnorm(mean=15,sd=1.5, n=100)
   b&lt;-rnorm(mean=1500,sd=150, n=100)
   df&lt;-data.frame(a=a,b=b)
   df$x &lt;- factor(seq(100), ordered = T)
   df.m &lt;- melt(df)
  
   ggplot(data = df.m, aes(x = x, y=value, colour=variable, group=variable)) +
   geom_line() + scale_y_continuous(breaks = c(seq(from = 0, to = 20, by = 1),
   seq(from = 1100, to = max(y), by = 100))) + 
   theme(axis.text.x = element_text(angle = 90, hjust = 1))
  </code></pre>
  
  <p>The problem is how to get the first set of breaks to be proportional to the second (thus visible). </p>
  
  <p><img src="https://i.stack.imgur.com/VOOjZ.jpg" alt="enter image description here"></p>
  
  <p>Any pointer would be very much appreciated, thanks!</p>