title: R programming - improving a minimal spanning tree plot using {ape}
body: <p>I tried the following codes to plot minimal spanning tree:</p>
  
  <pre><code>library(ape)
  mstree &lt;-mst(distmat) #distmat is a distance matrix
  plot(mstree, x1 = xycoordinates[,1], x2 = xycoordinates[,2])
  </code></pre>
  
  <p>if I command the above lines, I do get a minimal spanning tree diagram according to the distance matrix I specified, yet the graph looks bit boring because everything is black....if I want to change the colour of the tree "branches" into blue (i.e. from being black), how can  I do that?</p>
  
  <p>Thank you,</p>