title: ggplot2 axis: how to combine scale_x_reverse with scale_x_continous
body: <p>for my graph </p>
  
  <pre><code> ggplot(data=data, x=x, y=y, fill=factor(c)+ geom_path()+geom_errorbar()+   geom_point() 
  </code></pre>
  
  <p>I would like to plot the y.axis reverse, using</p>
  
  <pre><code>scale_y_reverse()
  </code></pre>
  
  <p>while define its limits, breaks, labels and expands.</p>
  
  <p>usually I use:</p>
  
  <pre><code>scale_y_continuous(limits=c(x,y), breaks=c(x,y,z), labels=c(x,y,z), expand(x,y))
  </code></pre>
  
  <p>well, apparently </p>
  
  <pre><code>scale_y_reverse()
  </code></pre>
  
  <p>and
      scale_y_continous()
  are  somehow considered as the same code!? As I get an Error, saying:</p>
  
  <p>"Scale for 'y' is already present. Adding another scale for 'y', which will replace the
  existing scale."</p>
  
  <p>I found a post saying that it is possible to combine the two commands, thus I tried: </p>
  
  <pre><code>scale_y_reverse(limits=c(x,y), breaks=c(x,y,z), labels=c(x,y,z), expand(x,y))
  </code></pre>
  
  <p>which doesn't work either.</p>
  
  <p>I am sure that there has to be a way, and as usual I suppose it is very simple.. once you know.</p>
  
  <p>I hope someone know how to solve this.</p>
  
  <p>Kind Regards</p>