How do I retrieve groupwise leaf nodes with Hierarchical Clustering?
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MathWorks Support Team
el 7 de Ag. de 2015
Editada: MathWorks Support Team
el 2 de Mzo. de 2021
I am using Hierarchical Clustering wants to know how to retrieve the leaf nodes for each cluster groups.
To give you the idea, please refer to the illustration just above the "Dendrograms."
I would like to find:
Group 6: 4, 5
Group 7: 1, 3
Group 8: 1, 3, 4, 5
(The enclosing group necessarily includes all: 1, 2, 3, 4, 5)
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MathWorks Support Team
el 2 de Mzo. de 2021
Editada: MathWorks Support Team
el 2 de Mzo. de 2021
As of MATLAB R2015a, a function for retrieving groupwise leaf nodes with Hierarchical Clustering is not available.
As a workaround consider the following script:
rng default; % For reproducibility
X = [1 2; ...
2.5 4.5; ...
2 2; ...
4 1.5;...
4 2.5];
Y = pdist(X);
Z = linkage(Y);
dendrogram(Z);
% A
n = size(Z,1)+1;
v = eye(n,n*2-1)>0;
for i = 1:n-1
v(:,i+n) = any(v(:,Z(i,[1 2])),2);
end
v = v(:,n+1:end)
% B
[index_row , index_column] = ind2sub(size(v), find(v));
index_row(index_column == 1).'
index_row(index_column == 2).'
index_row(index_column == 3).'
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