title: scale_color_manual() not working
body: <p>I am trying to get <code>scale_color_manual()</code> to work in <code>ggplot2</code> and I am not getting the colors.</p>
  
  <p>I am following the example at this <a href="http://www.cookbook-r.com/Graphs/Colors_(ggplot2)/#palettes-manually-defined" rel="noreferrer">link</a></p>
  
  <p>My dataset is <code>df</code> given by</p>
  
  <pre><code>structure(list(cond = structure(1:3, .Label = c("A", "B", "C"
  ), class = "factor"), yval = c(2, 2.5, 1.6)), .Names = c("cond", 
  "yval"), class = "data.frame", row.names = c(NA, -3L))
  </code></pre>
  
  <p>If I use the code in the example to make a bar plot, it works</p>
  
  <pre><code>ggplot(df, aes(x=cond, y=yval, fill=cond)) + geom_bar(stat="identity") + 
      scale_fill_manual(values=c("red", "blue", "green"))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/egIs1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/egIs1.png" alt="enter image description here"></a></p>
  
  <p>I changed the code to make a scatter-plot, I don't see the points in color now.</p>
  
  <pre><code>ggplot(df, aes(x=cond, y=yval)) + geom_point() + 
      scale_color_manual(values=c("red", "blue", "green"))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/1pdkq.png" rel="noreferrer"><img src="https://i.stack.imgur.com/1pdkq.png" alt="enter image description here"></a></p>
  
  <p>This could be trivial, but I am having a hard time finding what I am doing wrong here.</p>
  
  <p>Any help would be much appreciated!!</p>
  
  <p>Thanks</p>