title: R package Kohonen - how to plot hexagons instead of circles as in Matlab SOM toolbox?
body: <p>Is it possible to plot the SOM map (package Kohonen) with hexagons 
  as elementary forms instead of circles? Now the different plottings 
  (count, changes etc.) are plotted as circles with white surroundings.</p>
  
  <p>The aim is to create SOM visuals similar to Matlab SOM Toolbox.</p>
  
  <p>This <a href="http://forums.stat.ucla.edu/read.php?3,294,294" rel="nofollow">discussion</a> suggests hexagon plotting would not have been possible 2010.</p>