Begin with the disjoint clustering having level L(0) = 0 and sequence number m = 0.
Find the least dissimilar pair of clusters in the current clustering, say pair (r), (s), according to
d[(r), (s)] = min d[(i),(j)]
where the minimum is over all pairs of clusters in the current clustering.
Increment the sequence number : m = m +1. Merge clusters
(r) and (s) into a single cluster to form the next clustering m. Set the level of this clustering to
L(m) = d[(r),(s)]
Update the proximity matrix, D, by deleting the rows and columns
corresponding to clusters (r) and (s) and adding a row and column corresponding
to the newly formed cluster. The proximity between the new cluster, denoted
(r,s) and old cluster (k) is defined as follows. For the single-link method.
d[(k), (r,s)] = min d[(k),(r)], d[(k),(s)]
For the complete-link method,
d[(k), (r,s)] = max d[(k),(r)], d[(k),(s)]
If all objects are in one cluster, stop. Else, go to step 2.