title: scale_fill_discrete does not change legend labels -ggplot R
body: <p>I am having trouble changing my legend labels when I use ggplot2 in R. I have plotted a line graph with 7 lines corresponding to proportion of specimens with feeding strategy(y) over temperature zones (x). So far I have tried using 2 different methods to change the labels (which are currently 1-7) but neither changes anything. These are what I have tried:</p>
  
  <pre><code>plot + scale_fill_discrete("Feeding Type",breaks=c("1", "2", "3", "4", "5", "6", "7"),
     labels=c("Fungivorous", "Herbivorous", "Saprophagous", "Predacious", "Xylophagous", "Parasitoid", "Algivorous"))
  </code></pre>
  
  <p>and </p>
  
  <pre><code>plot + scale_shape_manual("Feeding Type",breaks=c("1", "2", "3", "4", "5", "6", "7"),
     labels=c("Fungivorous", "Herbivorous", "Saprophagous", "Predacious", "Xylophagous", "Parasitoid", "Algivorous"))
  </code></pre>