which point corresponds to which cluster in kemans function

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Manimegalai.M
Manimegalai.M 2012-9-12
hi to all.. i am using kmeans function for clustering.In that i am obtaining centroid locations. but i need which point corresponds to which cluster.because i need to fix the k value for the clustering.For that i need to calculate distance between each point and its corresponding cluster centroid......can anyone help me to find points corresponds to each cluster.

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回答（1 个）

Tom Lane
Tom Lane 2012-9-12
If you are using kmeans from the Statistics Toolbox, it sounds like the first output is what you want:
>> [a,b] = kmeans([0 0;0 .01; 1 1],2)
a =
2
2
1
b =
1.0000 1.0000
0 0.0050
This shows that the first two points correspond to cluster 2, with a centroid [0 .005], and the other point corresponds to cluster 1.
If you want to compute the distance between new points and the centroids, the pdist2 function might be useful.

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