how can we know that which cluster has which data points after applying k-means clustering ?

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satendra kumar 2018-7-11

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评论： Image Analyst 2018-7-14

My data size is 100*11. I have applied k-means clustering and clusters are generated. I want to know about the data points of each cluster.Please give me solution of it.

Thanks in advance

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Answer 1

KSSV 2018-7-11

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https://ww2.mathworks.cn/matlabcentral/answers/409819-how-can-we-know-that-which-cluster-has-which-data-points-after-applying-k-means-clustering#answer_328375

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kmean gives you classes of each cluster, from here it is easy to access the group/ class you want. Check the below code for demo:

K = 4 ;  % groups 
N = 5000 ;
x = rand(N,1) ; 
y = rand(N,1) ; 
% apply kmeans 
idx = kmeans([x,y],K) ;
% get each cluster
data = cell(K,1) ;
figure
hold on
for i = 1:K
    data{i} = [x(idx==i),y(idx==i)] ;
    plot(x(idx==i),y(idx==i),'.')    
end