title: Change point colors and color of frame/ellipse around points
body: <p>I want to start by saying that I am a novice user of R and especially of this website, so if it is necessary that I clarify anything here, please let me know! I don't quite understand everything yet, so please feel free to "dumb down" as possible. </p>
  
  <p>Question: I want to create PCA graphs depicting two groups (in this case species). I also want to draw ellipses or frames around them. </p>
  
  <p>Thankfully I have accomplished this task using ggplot2!
  However, I am not able to change the colors of the points or ellipses/frames beyond the defaults. </p>
  
  <p>Can you please offer some assistance on this matter? </p>
  
  <p>Please see example code below, which is just the traditional iris data set often used in PCA examples.</p>
  
  <pre><code>###load in plackages###
  library(ggbiplot)
  library(ggfortify)
  library(cluster)
  
  #my actual data is very similar to the iris data, though in my data the     "Species" column is first
  head(iris)
  Sepal.Length Sepal.Width Petal.Length Petal.Width Species
  1          5.1         3.5          1.4         0.2  setosa
  2          4.9         3.0          1.4         0.2  setosa
  3          4.7         3.2          1.3         0.2  setosa
  4          4.6         3.1          1.5         0.2  setosa
  5          5.0         3.6          1.4         0.2  setosa
  6          5.4         3.9          1.7         0.4  setosa
  df &lt;- iris[c(1, 2, 3, 4)]
  autoplot(prcomp(df))
  autoplot(prcomp(df), data = iris, colour = 'Species') #pca graph with   species depicted in different colors
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/2fouq.png" alt="PCA GRAPH OF SPECIES DEPICTED IN DIFFERENT COLORS"></p>
  
  <pre><code>autoplot(prcomp(df), data = iris, colour = 'Species', shape='Species', frame=T) 
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/RhorB.png" alt="PCA GRAPH WITH FRAMES AROUND POINTS"></p>