How do I retrieve groupwise leaf nodes with Hierarchical Clustering?

Illustration
kanshasmith - 2022-04-02T11:13:30+00:00
Question: How do I retrieve groupwise leaf nodes with Hierarchical Clustering?

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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    • Expert Answer

    Profile picture of John Michell John Michell answered . 2025-11-20

    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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