title: How to plot a label with the similarities between groups using R?
body: <p>When I use the command hclust in R, to plot a dendrogram, I get the y axis labeled as Height. However, I'd like to label this axis with the similarity levels between the groups in my dataset, something like the image below. How can I achieve this?</p>
  
  <p><img src="https://i.stack.imgur.com/f2n91.jpg" alt=""></p>
  
  <p>Here is a minimal example:</p>
  
  <pre><code>set.seed(1)
  x = matrix(rnorm(1000), ncol=100)
  d = dist(x, method="euclidean")
  plot(hclust(d, method="complete"))
  </code></pre>