Question about k means clustering

Hi there,

After you have clustered data, how can you find out or get a print out of what cluster each point has been assigned to?

For example if I cluster this simple data, how can I find out which cluster each data point belongs to

X = [randn(100,2)+ones(100,2);...
   randn(100,2)-ones(100,2)];
opts = statset('Display','final');
[idx,ctrs] = kmeans(X,2,...
                  'Distance','city',...
                  'Replicates',5,...
                  'Options',opts);
plot(X(idx==1,1),X(idx==1,2),'r.','MarkerSize',12)
hold on
plot(X(idx==2,1),X(idx==2,2),'b.','MarkerSize',12)

Thank you

Answer 1

[bym]

Isn't it the

idx

variable which you have plotted in different colors?

Answer 2

[John]

Yes it is! Thanks