title: how to plot the results of a LDA
body: <p>There are quite some answers to this question. Not only on stack overflow but through internet. However, none could solve my problem. I have two problems </p>
  
  <p>I try to simulate a data for you </p>
  
  <pre><code>df &lt;- structure(list(Group = c(1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 
  2, 2, 2), var1 = c(2, 3, 1, 2, 3, 2, 3, 3, 5, 6, 7, 6, 8, 5, 
  5), var2 = c(9, 9, 9, 8, 7, 8, 9, 3, 2, 2, 1, 1, 2, 3, 3), var3 = c(6, 
  7, 6, 6, 5, 6, 7, 1, 2, 1, 2, 3, 1, 1, 2)), .Names = c("Group", 
  "var1", "var2", "var3"), row.names = c(NA, -15L), class = "data.frame")
  </code></pre>
  
  <p>then I do as follows: </p>
  
  <pre><code>fit &lt;- lda(Group~., data=df)
  plot(fit)
  </code></pre>
  
  <p>I end up with groups appearing in two different plots. </p>
  
  <p>how to plot my results in one figure like e.g. <a href="https://stackoverflow.com/questions/20196490/linear-discriminant-analysis-plot?rq=1">Linear discriminant analysis plot</a>
  <a href="https://stackoverflow.com/questions/20197106/linear-discriminant-analysis-plot-using-ggplot2?rq=1">Linear discriminant analysis plot using ggplot2</a></p>
  
  <p>or any other beautiful plot ? </p>