code: public static PlotCanvas plot(String id, int[][] merge, double[] height) {
          int n = merge.length + 1;
          Dendrogram dendrogram = new Dendrogram(merge, height);
  
          double[] lowerBound = {-n / 100, 0};
          double[] upperBound = {n + n / 100, 1.01 * dendrogram.getHeight()};
  
          PlotCanvas canvas = new PlotCanvas(lowerBound, upperBound, false);
          canvas.getAxis(0).setGridVisible(false);
          canvas.getAxis(0).setLabelVisible(false);
  
          dendrogram.setID(id);
          canvas.add(dendrogram);
  
          return canvas;
      }
docs: Create a dendrogram plot.
  @param id the id of the plot.
  @param merge an n-1 by 2 matrix of which row i describes the merging of clusters at
  step i of the clustering. If an element j in the row is less than n, then
  observation j was merged at this stage. If j &ge; n then the merge
  was with the cluster formed at the (earlier) stage j-n of the algorithm.
  @param height a set of n-1 non-decreasing real values, which are the clustering height,
  i.e., the value of the criterion associated with the clustering method
  for the particular agglomeration.