%% Drawing a Polar Dendrogram
%
% Sam Roberts
% Copyright 2006 The MathWorks, Inc.
%%
% We're all familiar with hierarchical cluster analysis, and the
% dendrograms it produces as output.
X= rand(100,2);
Y= pdist(X,'cityblock');
Z= linkage(Y,'average');
dendrogram(Z,'colorthreshold','default');
%%
% By default, if there are more than 30 points in the dataset, dendrogram
% collapses the points into groups, to improve the look of the
% visualisation. Sometimes you don't want this - but showing all 100
% points in the dataset results in a rather cluttered plot.
dendrogram(Z,0,'colorthreshold','default');
%%
% This can be improved upon by using a polar dendrogram, which spreads out
% the leaf nodes around the circumference of a circle.
polardendrogram(Z,0,'colorthreshold','default');
%%
% Sometimes the angled view is nice, sometimes you might prefer a top-down
% view.
clf
polardendrogram(Z,0,'colorthreshold','default');
zoom(0.8);
view(2);
