Assigning a new data point to a cluster in hierarchical clustering

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I have clustered my data X with hierarchical clustering in the following way:
Y = pdist(X);
Z = linkage(Y);
T = cluster(Z,'maxclust',2);
How can I determine to which cluster a new data point (not in X) should be assigned to? For k-means one can just assign the data point to the cluster with the nearest centroid but for hierarchical clustering I don't see how to do it.

Accepted Answer

MHN on 4 May 2016
If you know your maxclust is 2, then just use 2-means. Hierarchical clustering and linkage will give you an insight about the number of natural clusters in your data. When you found that k' (e.g. using 'cutoff') based on hierarchical clustering, you can use k'-mean.
  1 Comment
Sepp on 4 May 2016
Thanks for your answer. I don't know that maxclust has to be 2, it was just an example. How can I find out which number of clusters my data naturally has with hierarchical clustering?

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