title: Increase number of axis ticks
body: <p>I'm generating plots for some data, but the number of ticks is too small, I need more <em>precision</em> on the reading.</p>
  
  <p>Is there some way to increase the number of axis ticks in ggplot2?</p>
  
  <p>I know I can tell ggplot to use a vector as axis ticks, but what I want is to increase the number of ticks, for all data. In other words, I want the tick number to be calculated from the data.</p>
  
  <p>Possibly ggplot do this internally with some algorithm, but I couldn't find how it does it, to change according to what I want.</p>