title: How can I control y-axis ticks and x-axis ticks independently in ggplot2?
body: <p>I want to remove axis ticks from the x-axis without removing them from the y-axis.</p>
  
  <p>Right now, I can get both to be removed using:</p>
  
  <pre><code>axis.ticks=theme_blank()
  </code></pre>
  
  <p>For instance:</p>
  
  <pre><code># Generate data
  c &lt;- ggplot(mtcars, aes(factor(cyl)))
  
  c + geom_bar()+opts(axis.ticks=theme_blank())
  #c + geom_bar(width=.5)
  #c + geom_bar() + coord_flip()
  #c + geom_bar(fill="white", colour="darkgreen")
  </code></pre>
  
  <p>But I don't know how to control them independently.</p>