How do I find the indices of the Self Organizing Map (SOM) training set output

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herrysingh - 2021-05-14T16:02:48+00:00
Question: How do I find the indices of the Self Organizing Map (SOM) training set output

I'm using the SOM toolbox and have created the following: net = selforgmap([10 10)]; [net,tr] = train(net,inputs); where 'inputs' is a 5x10000 matrix of 5 parameters with 10000 samples.   using plotsomhits(net,inputs); shows how the 10000 samples are getting clustered.   Question: How do I output where each individual vector is clustered? For example where on the 10x10 grid is vector #1 located?

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    • Expert Answer

    Profile picture of Neeta Dsouza Neeta Dsouza answered . 2025-11-20

    Here is an example that should help you:
     
     
    net = selforgmap([10 10]);
[net,tr] = train(net,inputs); % Classify input data
op_som = vec2ind(net(inputs))';
    for each input in inputs, op_som will have a numbering between 1 to n based on which cluster it belongs to.
     


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