Counting How Many Cluster Index

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Alvi Syahrin
Alvi Syahrin il 24 Mag 2013
I am doing clustering with k-means, and here is the code:
[g c] = kmeans(data,k,'dist','SqEuclidean');
g is the cluster index
c is the centroid
k is the number of clusters, I input '3' in it.
When the code is executed, here is the sample result:
40 60 69 1
50 75 78 2
65 70 75 2
79 80 72 3
88 80 80 3
36 67 66 1
40 60 69 1
77 85 65 3
76 77 79 3
My question is, how to count the cluster index for each cluster? What script I should write to show this thing:
"Cluster1 has three members
Cluster2 has two members
Cluster3 has four members"
I'm getting confused because the cluster index only have one variable. Any idea?
Thank you.

Risposte (1)

Tom Lane
Tom Lane il 24 Mag 2013
Look at these, and see if it helps:
unique(g)
find(g==3)
  1 Commento
Alvi Syahrin
Alvi Syahrin il 24 Mag 2013
Thank you. Anyway, it is working with accumarray function. ^_^

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